Flash photography used to be pretty wild

I see spots.
Many thanks to Gav ‪@theslowmoguys‬ for making this video possible!
Links 'n Stuff:
If you haven't seen that video of the speed of glass, go do that now.
• How fast does glass cr...
My Photography playlist:
• Photography
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[@theslowmoguys]

Brighter and goopier than I could have possibly imagined.

[@spartenz14]

Dan looks weird in this video

[@kaptainKrill]

I love that my favorite KZbin channels are collaborating together more and more. It’s a regular KZbinr extended universe

[@mysticmarble94]

Awesome 😲

[@brightsde3511]

How did you already watch the vid? its only been out for 14 minutes and the vid its self is 30 mins

[@spartenz14]

@@brightsde3511 you get to watch videos a day or so early if you're a supporter on Patreon

[@MinerMike24]

I’m a little disappointed we didn’t get a “And through the magic of buying two of them!” as Dan stepped into frame at the start there

[@DogsRNice]

Biggest missed opportunity in youtuber crossover history

[@speeter6345]

Same, i even said it while watching hoping he was going to say it too

[@TheVeryHungrySingularity]

I was completely prepared for this to happen

[@piparalegal2019]

Agreed!

[@Galerak1]

I was disappointed we didn't get any Dan as well, even if it was only a 'Dan walking in from stage right with a good old British "What the bloody 'ell is goin' on 'ere then?" in the outtakes at the end.

[@LtJMP]

As a person who worked in a G.E. Lamp Plant for over 20 years making the actual bulbs for the FlashCube, SuperCube, HiPower, MagiCube, & FlipFlash (names such as GE, Osram, Wootan, & several store brands); your assessment of the parts (glass bulb, glass beads, zirconium/magnesium foil, tungsten filament, oxygen, primer, etc...) were spot-on. The most dangerous part of the process was the use of the primer for MagiCube, which the post was dipped into. (A safer & different primer was used to dip the tungsten filament & electrical posts for the other flash bulbs. That primer wasn't as pressure sensitive.) The cup that held the primer was changed every 3-4 hours. As long as the primer wasn't dried out on the inside of the dip cup; which happens as the level in the cup drops, it was safe. BUT dried primer was extremely volatile & accidents have happened. As a side note... back in the heyday of chemical flash; our plant was just one of several that ran over 100 machines; each machine producing 2000-2500 bulbs/hour, 24 hours a day, 6+ days a week, for about 20 years. THAT'S A LOT OF BULBS!!

[@dualpapayas]

Really cool insight, thanks for sharing!

[@wta1518]

That's almost 30 billion bulbs!

[@Howlin000]

Wow!

[@sanis799]

I’m

[@orandilu989]

Thank you, LtJMP, you popping in here with your experience is a wonderful reason behind what makes the internet so great!

[@theoneandonlyflexo]

That face at 30:52 is just priceless. The eyebfow raise the way the face just becomes unveiled from the darkness. Just perfect.

[@ardamilk7606]

Came to make sure someone had already brought this magnificient moment to light. My favorite shot too.

[@reru_personal]

​@@ardamilk7606I like the pun in your reply,

[@fifiwoof1969]

33:41 the box of crap is SUPER important.

[@ttty2242]

Like a mix of Doctor Who and Mr. Bean

[@ElectroBOOM]

I do remember people using those Magicubes!!! eh... I'm old I guess...

[@malinicula797]

i see some people using these to this day

[@VAXHeadroom]

*I* used them - have boxes of pics I took with an old Kodak w the Magicubes!!

[@christo930]

I remember being sent to the local rite-aid to buy them in the middle of a party. I was a kid in the 70s when these things were at their peak. But they died very quickly. I had no idea these started in 65. I thought they were much older. By 1980 they were gone.

[@elizabethpemberton8445]

Me too - born in 1969, played with the used Magicubes from my parents’ cameras as a kid, and then my first camera in 1980 was a Kodak that both took 110 film cassettes and had a built-in electric flash that slid open and shut, so you replaced batteries instead of the bulb. They also used a 16mm film camera for home movies and the light for that was also as bright as the sun, it seemed, so all those indoor home movies have us kids squinting and holding up hands against the light. I also half-remember all the smells involved with the Magicubes and the film camera and playing the movies. You don’t get those with phones…

[@paulmurgatroyd6372]

@@malinicula797 I remember seeing a camera with a cube stick on it in about 1973.

[@MeriaDuck]

Using 2020s era photo tech to see 1960s era photo tech at single digit microsecond time intervals is an actual technology connection. ❤

[@bobweiss8682]

I'm sure the engineers at Sylvania, GE, and Kodak would have killed for a camera like that during the development process...

[@TheLaXandro]

1963: there's not enough light! 2023: there's too much light!

[@nickbob2003]

@@bobweiss8682that’s what I was thinking too. The people who made these did so without the benefit of being able to see what is happening. I’m sure they would love the footage and it makes me wonder if they would be surprised by anything or just say, yep that’s how I designed it

[@shaider1982]

@@bobweiss8682 Some form of the tech probably existed but for governments/military, to expensive for them.

[@YT-Observer]

@@shaider1982 not single digit microsecond exposures

[@acem7749]

You just answered an old mystery of mine by sparking an old memory. When I was a young whippersnapper probably under the age of 8 I discovered electricity. I would like to hook a bunch of batteries together in series and connect random things to them(motors, leds, random components that would just get hot). One of the things was an interesting looking light bulb that looked just like the ones you're showing... I connected it to probably about five or six C cells. Then BAM! Mega flash blinded me scared the shit out of me I was like I need to respect the batteries more. At that time I thought I just blew the thing up now I know it worked as design. Remember my grandma watching in the background and giggling.. That evil woman taking joy in my response 😅 ❤ lol. All this time now i know!

[@chasler1741]

Grandma knew what she was doing. You were supposed to find that flash bulb.

[@ildart8738]

There is a saying in Russian: every man is a boy who survived by accident. Considering the much riskier experiments we did as kids in the 90-s, I can say that I survived by an accident too. Flashcubes don't even come close to our experiments.

[@Pcrrc-zx7ic]

In my college years in the early 80's I was in the co-op Engineering program at General Electric. I worked at a plant that made flashcubes. We conducted reliability testing by exposing the flashcubes to high humidity for several weeks. Once the data was collected and the tests were completed, I would take the flash lamps out of each cube and combine them in a large grocery bag which was quite dangerous due to 'sympathetic flash', which means when one lamp flashes, they all flash. I'd connect 2 wires to one lamp, put it in the middle of the bag which held several hundred lamps, place it on the porch at night and wait for my roommate to come home. Touch the 2 wires to a 12 volt battery and you'd get what looked like a small nuclear explosion scaring the hell out of him. Great fun back in the day. 33:52

[@RoseBrassSarah]

Sympathetic what! Oh Lord! That sounds like a heck of a prank.

[@joshyoung1440]

Several... several hundred... yeah I'd laugh if it were just the roommate, _maybe,_ that still sounds kinda dickish, but it sounds like this was done outside, on a porch, where it could scare neighbors and pets. At night.

[@micahphilson]

The craziest part would be how silent it would be! Like, with a flash that big, you expect a massive bang as well, like a bomb just went off, but it's just a quick, silent flare out of nowhere!

[@Pcrrc-zx7ic]

@@micahphilson Exactly

[@h8GW]

It's a homemade (and a very expensive) flashbang

[@OwOraTheWitch]

I love how so many youtubers bring Gavin on not because of clickbait, but because of his equipment and experience. Like, barely anyone mentions that they got him on in the title or thumbnails, so you just get surprise Gavin in the middle of a video, and honestly I love that.

[@Aviertje]

Yeah. It makes me feel bad for Dan. When are other KZbinrs going to need an almost-disposable english dude for some hazardous tests? He deserves some love, too!

[@Atmatan_Kabbaher]

How collabs should be

[@c4rr07]

@@AviertjeDoesn't Dan still live in the UK? I was under the impression he travels to the states for a big filming batch periodically, and then the actual videos come out over time as they're edited. Must be awkward to sync that up with _other_ KZbinrs as well.

[@MrNoipe]

It's mostly the million dollar camera

[@gorak9000]

what other non slow mo guys videos has he been in?

[@jegog.]

My Uncle, Bernard Kopelman, invented the Magicube. He was the head of research at Sylvania Lighting. I remember him explaining how it worked back around 1970 when I was a teenager. He was a material scientist and before working at Sylvania he was involved in the Manhattan Project developing materials for nuclear reactors. Sylvania (GTE) rewarded him for his work on the Magicube by making him the Vice President of their materials division. He regretted the promotion the rest of his career since he was an inventor at heart and did not enjoy being a manager. My uncle got me a summer job at the Sylvania factory in 1976 when they were developing a machine to make a million electronic flash tubes.

[@C4CH3S]

That's awesome. Shame your uncle didn't get to keep inventing things like he wanted. This is a very common feeling talented engineers have even today.

[@vigilantcosmicpenguin8721]

Wow, your uncle was a wizard?

[@isaac10231]

Woah, you should into contact with Alec!

[@salvatoreshiggerino6810]

So which fulminate did they use?

[@bb5242]

This is such an American type of story that doesn't hardly exist today at all. All our innovation seems like it is just gone.

[@jc-d6179]

I did a second year university project on the materials and processes within the Magicube in 1986 - when they were still a current technology. The oxygen inside is pressurized so as to allow a greater mass of burning zirconium per bulb for a brighter flash. The ignition tube encloses a wire post, centred up the middle. The post is coated with a pyrotechnic compound, so that when the striker wire hits the outside, the tube is crushed onto the post, pressurizing the pyrotechnic coating hammer and anvil style for a more reliable ignition. A fantastic project. Thanks to Prof. Jim Williamson for that opportunity!

[@EWDDG]

When I was in EW ‘A’ school in the early 70’s on Treasure Island, there was also an ET school where Navy Electronic Technicians were trained to troubleshoot and maintain a high powered radar. Not far from the ET school was the Navy Exchange. One morning as the high power radar was energized and the students were working on it, the altitude adjustment of the rotating antenna slipped and the antenna angle dropped. As the antenna’s rotation swept by the Navy Exchange, all the fluorescent ceiling lights lit up from the RF energy and all the flash bulbs and magicubes were set off.

[@charmio]

😂That's brilliant! Reminds me of the story told during a Tom Scott video interviewing James Lovelock, the man who first invented a microwave (to revive frozen hamsters.... what a wild story! 🤯). The magnetron would generate a field with just the right wavelength to make the foil strips in pound notes act as antennas with similar destructive results!

[@sparky6086]

When I was in the Army, we'd stick a fluorescent tube from one of the ceiling light fixtures in our field communications shelter, into the RF output of the transmitter, to quickly check, if it was transmitting any power. "Field Expediency".

[@actually5004]

Certain brands of automatic garage door openers really don't like the AN/SPQ9 on our destroyer, not that the Navy ever admits anything at san diego...

[@jozefbania]

And all get enough rads?

[@pastaman264]

​@@jozefbaniaIt's relatively low frequency electro magnetic radiation so the worst it can do is cook you like a hotdog

[@vailpcs4040]

I'm not ashamed to share that I once picked up an already-opened box of magic cubes and they all slid out and hit the garage floor and ALL went off at once. That was an expensive lesson back in the day.

[@Gractus]

As soon as Alec showed the mechanism I wondered to myself if they could go off if someone dropped them. So that's a yes then. It's like a ninja smoke bomb haha.

[@Fan-lq6uv]

Makes one wonder how the store dealt with customer complaint that a new box were full of blown bulbs because it got dropped?

[@Dargonhuman]

@@Gractus More like a ninja flashbang...

[@DUKE_of_RAMBLE]

​@@Fan-lq6uvHell, I'd be slightly concerned about the amount of light generated by a potential 12 flashes going off *simultaneously,* causing the cardboard package to ignite from all the heat! (... and incase anyone wants to think that's _not_ possible, just remember what the sun + a magnifying glass can do 😅)

[@vigilantcosmicpenguin8721]

@@Fan-lq6uv Come to think of it, I wouldn't want to be the USPS worker handling those.

[@VincentCouwenberg]

I love Gav going “na na na naa na na na” at 32:42 It makes me feel like he’s a genuine fan of your channel.

[@DavidLindes]

Yeah, I had the same thought. Yay. Definitely a fun collab to see! Thanks, both! 🎉📸

[@joolsstoo3085]

I had subtitles on. Thats when the "blindingly smooth jazz" starts.

[@Karnnos]

I think Alec should have synchronized this part with an actual music.

[@isaacfortner]

I watch and listen to Gav’s other stuff through Rooster Teeth, and I want to say he’s mentioned enjoying watching Technology Connections before.

[@MontyTFox]

​@@isaacfortnercan confirm, I remember him mentioning it

[@icarickarusgaming5658]

I love the little turbo whine that the electric flash bulbs had when revving up to fire.

[@mythex8698]

1:52 I had the same reaction! It was a pleasant and nostalgic brain tickle.

[@foxxy46213]

Yes I remember that charging the capacitor whine as I got a huge electric shock taking one apart poking one with metal screwdriver as a kid....hurts like hell, got more kick than any 240v shock I've ever hqd

[@sunnyokapi]

@@foxxy46213 i did the same with a disposable camera not once, but twice as a kid xD

[@foxxy46213]

@@sunnyokapi yep same..had to poke it twice as I thought how can 3v zap like that

[@Nexalian_Gamer]

I remember taking one apart as a kid. It was a newer camera that used xenon flash tubes. I never got shocked. However, I did get an unpleasant surprise when something shorted the capacitor and made a nice little fireworks display@@foxxy46213

[@sschmidt1775]

32:20 "flash for one frame .. $0.25 .." I had to switch in my mind from the 200.000 frames PER SECOND Gav just shot to the one frame of film he meant...

[@NoahErickson]

As a kid (born in '78) I would dismantle the blue dot flash cubes and throw the bulbs on the concrete (post down, of course) for magic ninja escapes when playing with friends after sunset. Until my parents discovered we suddenly had no flash cubes.

[@orangejuliaa]

what do you mean by "post down"?

[@pietrog]

@@orangejuliaathe part with the fulminant

[@NoahErickson]

As a kid, I think possibly they didn't figure out I needed glasses yet at that point, I thought the bulb was solid glass with a solid metal post sticking into it. I didn't realize it was hollow, and that the "post" was also hollow and contained a fulminate of some sort.

[@orangejuliaa]

@@NoahErickson ohhh i thought you meant post as in like after, thanks for the explanation

[@philipfreeman]

Yes, I used to do the same. I would even heat the bulb to remove the film, so it would literally explode. Yes, it's a wonder I lived to the ripe old age I am now, and with all my fingers!

[@65gtotrips]

As a 62 year old man, I think it’s hysterically funny that young people, as in this content creator are so fascinated by the way things were done only 40 years ago. Yet, it’s the same curiosity as I have about generations before my time as in the 1930’s thru 1950’s.

[@christopheralthouse6378]

Being 41 myself, I find it amazing just how many things that used to be parts of my everyday life have become ancient relics of a bygone era…seeing younger generations coming along and rediscovering these relics…and really deep diving into them like Alec does, just brings a smile to my face every time… It’s why I’m a subscriber…☺️

[@blakksheep736]

Give us a break. 😆 I'm nineteen. Flip phones have been around longer than me. This, to me, is incredible.

[@shadowwolf3098]

i love old things to the point where i want to someday collect old hardware. my current stock of old hardware is a commodore64, ti99a4, and an original atari (which is sadly hit or miss when it comes to working). I'm 19 and id absolutely love to own more hardware, rarer hardware from back in ye olde days

[@katherineanand5892]

As an 18 year old, I do not know how to use photoshop, but I can shoot, develop, and print large format.

[@jool]

Lol. I'm 38 and i work with guys who are mostly around your age. I'm starting to embrace being the old guy. I got my first flip phone in 2004 when i was 18. Imagine a 19 year old in 20 years saying the iphone is older than them. 😂 @blakksheep736

[@jpeabody1155]

I am 60 and I remember these very well. You said it was such an ordeal to do all this. But at the time it wasn't. We did not have the luxury of the mobile phone and we knew nothing different. Most of us used to carry our cameras in a camera bag which had space for flashbulbs, flash cubes, batteries, spare film etc. It also meant that we had to become very familiar with exposure rates and the types of films we needed to get the shots we wanted to get. Yes, there was an expense involved, but that just meant we gave a lot of thought to the pics we wanted to take and we did not waste exposures on trifling trash like pictures of a meal we were just about to eat. It also meant that we ended up with photo albums galore and drawers full of photo's. So there was good and bad. Even now I look through pictures of my childhood and I compare them to pictures of my grandchildren that I have taken on my phone. The joy for us nowadays is the spontaneity of taking a pic of a situation. However with the earlier cameras, like the Kodaks and then later, the SLR cameras, we had the joy of getting the picture "Just right" and then the nervous wait of getting the film processed only to realise we had left the lens cap on. So it was not an "Ordeal", it was simply all we had at the time and we made the most of it.

[@ryanmccawley6301]

Imagine being the engineer who designed these and finally being able to see how it works not just understand it theoretically or in testing.

[@linksbro1]

The Blue Dot in the bulb (known as the Sylvania Blue Dot) is actually to indicate whether or not the bulb has leaked its sealed low pressure oxygen atmosphere, if the blue dot turns pink, the bulb has leaked and is likely to explode.

[@leevons_home_vids]

Thank you for that. I was hoping he might talk about what it was for but he didn't. I was wondering a out it

[@tinman5322]

I remember the commercials advising that if the blue dot was black it was a sure way to know the bulb was spent (but they used much smoother language). I thought it was ridiculous since every bulb that fired melted almost all the way through the shield.

[@Zaurthur]

blue dot, in sealed bulb

[@16vSciroccoboi]

Why would it explode? If it's leaked wouldn't it be less likely to explode? It goes from full Oxygen environment to atmosphere

[@linksbro1]

@@16vSciroccoboi because it's a LOW PRESSURE oxygen rich atmosphere, which is BELOW ambient atmospheric pressure. Being AT atmospheric pressure could potentially mean there's more oxygen inside than intended for a controlled reaction.

[@JimFaindel]

I love how Gavin knew and performed the ending jingle, now that's a true friend!

[@antipoti]

Exactly my thought, it was such an amazing ending, with a so smooth and heartful transition, the music slowly creeping in. Just perfect!

[@BobOBob]

I probably had not thought about those since 1981:. In college I disassembled a lot of Magicubes. I did study them with interest, but mostly I got a bunch of packs cheap, and used them as fireworks. I also got ""into"" trouble once with them. And, by into, I literally mean out of. My first-hand experience says, thrown onto pavement from a moving vehicle, they had about a 70% chance of triggering. At night most people can't continue to drive, for at least a couple of minutes, if they were looking right there. So throw three to get the job *done* and get out. POOF and vanish like a magician.

[@cdstoc]

This was incredible! I used flashbulbs and cubes from childhood through my teen years. I've tried to convey to people in their 30's and younger how expensive it used to be to take pictures, so taking them was reserved for special occasions, i.e. "Kodak moments". It's also another example of how even the most seemingly simple thing can be far more complex than imagined.

[@justinthehedgehog3388]

I miss that. Photographs were much more precious than today. They meant so much more. I've been careful to look after all my old snaps from the early 80's.

[@noodlefunny]

the bokeh effect at 28:32 is INCREDIBLE. Great video

[@patrioticpanda7618]

Funny seeing you here

[@TheBloodyViki]

It really is beautiful

[@formdusktilldeath]

reminds me of christmas lights instantly

[@Ogaitnas900]

I really thought grandma would be waving at me from the light.

[@MattH-wg7ou]

That was beautiful!

[@Faris_V5]

I want to bottle the feeling I got upon hearing you say "slow mo guy"... and then not just pass it off as a joke! I can't believe you didn't clickbait Gav when it would've been so easy to and it lead to such a delightful surprise as I had not looked at the description nor comments yet. So, thank you for that. It brought joy to my heart.

[@MrBattlecharge]

I want to get rid of the feeling I got upon hearing him say "slow mo guy" instead of "one of the slow mo guys" - its daneraser

[@Jo-hw6pp]

1:22 ​@@MrBattlecharge Xxx

[@gefagnis]

same

[@KalebPeters99]

Around 3mins in I was literally drafting a comment in my head about how it would be so cool to see these flashes go off in slow motion, and of course a collab with Gav (and/or Dan) came instantly to mind. Seconds later I was grinning ear to ear, cursing myself for ever doubting Alec 😅😅😅

[@davemccage7918]

They should have just called Michael Bay’s cameraman and asked him how he got those slo-mo flashbulb shots in “Pearl Harbor”. That’s the movie that taught me that cameras were a lot more explodey back in the day.

[@lduker9731]

That was a great video and collab (from two of my favourite KZbinrs) thoroughly enjoyed it. “And a box of crap” lmfao at that line.

[@GeofreySanders]

He nearly got me with that one, right as I was taking a drink.

[@lexluthermiester]

@TechnologyConnections @TheSlowMoGuys This was most excellent!! I always wondered about the process of how these tiny and yeah amazing bright flash elements worked and you folks showed it all in intricate detail! Thank You!!

[@Loop_Kat]

The fact that this is one of the rare times in Slow Mo Guys history where there was actually too _much_ light for the camera really says a lot about how insanely bright these things burn Also, love the shot at 30:47

[@darrennew8211]

That and the recent "shaped charge" video, yes.

[@johannweber5185]

​@@darrennew8211 There also was a video about actual thunderbolts.

[@Zippsterman]

"Very calibrated, easy to set-off firework" is also match-grade ammunition

[@0neDoomedSpaceMarine]

Is it really though? How consistent is the burn and produced light between individual flash bulbs? How consistent is each shot on a cube, how consistent are cubes amongst each other?

[@asacreglow6422]

​@@0neDoomedSpaceMarineProbably more consistent than the steel core ammo we're outshooting you with

[@whyiwakeup6460]

@@asacreglow6422 ??? outta pocket behavior

[@timace1]

This is quite possibly my favourite video of all time. Well done to both you and Gav.

[@MrBenenator]

This video may be just a flash in the pan, but it really lights up my life! I'm glad that coating in the bulbs was all it was cracked up to be, otherwise their popularity really wouldn't have blown up. Looks like you had a smashing good time, with a picture-perfect finish! Consider this a glowing review. :)

[@mpbx3003]

That shot at 30:47 might be the best thing out of many very good things to have happened on this channel. It's so perfect in composition and framing.

[@rivkahwinter]

My thoughts exactly

[@everythingbrassorange]

Might need to be the new channel profile picture

[@bobosims1848]

Actually, I found the burn of the broken tube at 28:30 rather unexpected...

[@SuburbanDon]

The Big Bang

[@PlittHD]

Stupid idea: Make each frame of this shot a picture and set it as a Desktop Wallpaper slideshow where it'll get brighter each hour

[@light-master]

You missed a joke with Gav and Dan about "through the magic of buying 2 of them" 🤣

[@nathanhachey]

I waited the whole video for this joke!

[@curiousfirely]

Absolutely!!

[@AlexSh789]

I was more disappointed at the absence of "the magic of having four of them!" when introducing the cubes.

[@ranolden9717]

I mean. Do we really want Alec to go to prison for taking apart a slow-mo guy?

[@nathanhachey]

@@ranolden9717 excellent point

[@Gerald_Hunker]

This teamwork with Gav surely was the most awesome video you ever made! Thanks so much for the effort! I vividly remember those bulbs from my childhood. Used bulbs sizzling and smoking, carefully popped into an ashtray, "don't touch, boy!!". The whole process was fascinating and a bit scary. "Watch out, daddy's going to take a flash picture!" But up to now, I never knew how they really worked. Great footage, great job, thanks again 👍🏼👍🏼

[@FantasyReader321]

What a fabulous duo! Thanks Gav for making my favorite show that much better!

[@JefferyPierce]

That seemingly evil-looking shot of your mug appearing at 30:52 just cracked me up! 😅

[@williamreynolds6132]

I was repeating that time in my head until the end of the video. Such a weird thing to think of all that went into that photo getting made.

[@headwerkn]

surprised Alec didn’t use it as the thumbnail 😂

[@renasouza8261]

I haven't laughed so hard in at least a decade 😂😂😂

[@youdontknowme5969]

🤪

[@Taolan8472]

That shot would be right at home in the montage of a mad scientist working just before "IT's ALIVE!"

[@elektro3000]

The way your face with that expression of pure insanity just fades into existence at 30:52 is probably the funniest thing I've ever seen on your channel. I just keep replaying it and I can't stop laughing.

[@vigilantcosmicpenguin8721]

alec jumpscare

[@rootbrian4815]

I know right?!?! xD

[@acd6374]

A true mad scientist.

[@JC-jv5xw]

It's like the manic grin in the reflection on the toaster.....

[@eamonia]

This is some of the best slo-mo footage I've ever seen. Awesome, dude.

[@Kitteh.B]

Unrelated to what a fantastic and informative piece your videos always are, but... wow. The bokeh on that first shot of the open-air filament actually made me go 'whoa' out loud. Perfect circular bokeh, and plenty of it! The slow-mo adds so much to the explanations of how the flash bulbs work.

[@HoneyMike]

I love the collab, that filament explosion at 28:32 is some of the most beautiful footage I’ve ever seen

[@bryanayer]

Right? I NEED a 4k wallpaper of that

[@AwsomenessEpicness]

I didn’t think it was even real for far too long

[@chelsealynn9866]

It was gorgeous. Reminds me of early CG art from the 90s.

[@CheapFlashyLoris]

Even more beautiful than the sequence at 30:47?

[@gblargg]

Agreed, the various clips were captivating, some of the best slow-mo footage I've watched. It reminds me of those movie reels from the Space Shuttle liftoff pad ("Best of the Best").

[@Paul_Wetor]

"The sun is pretty stinking bright". Your mastery of technical jargon really makes this channel fun.

[@LittleDancerByGrace]

I never fail to learn something on this channel. 😛

[@stevenclark2188]

I think I once did the math to find than an indoor area that I thought had fantastic lighting was still something like 10 stops dimmer than it was outside, an that might have been the shade. The conscious side of the brain just refuses to believe how much the visual side of the brain is lying to it.

[@TheBroz]

This is amazing, thank you so much Alec & Gav.

[@user-ls2ee2lt1z]

There is no better channel to go one level deeper and speak about all the crazy things light does in its interaction with cameras. All the sublevels of photo specific light stuff, lumens vs lux and such. Great vid!

[@jezeski2011]

I like that blooper at the end: "You still have to carry this and a box of crap"... priceless LMAO

[@averyalexander2528]

Today I learned we innovated on the lightbulb, which was initially famous for its long life by having a durable compact filament in an enclosure with no oxygen... by creating a bulb famous for its short life, by having a volatile, long filament in an enclosure of pure oxygen. BRILLIANT!

[@trevinbeattie4888]

“Brilliant” in _both_ senses of the word! ;)

[@KurosakiYukigo]

It's like taking a test and getting every answer wrong.

[@mehcutcheon2401]

I see what you did there...

[@lucaswarriorteammining5786]

The issue with longer lasting ones is that they only last so long if you're not turning it on or off constantly. It practically needs to stay on to last long.

[@nobodyinteresting9967]

Uno revers card hahaha

[@stephgreen3070]

I have such such fond memories of flash bulbs and cubes. I could almost smell them as you were setting them off. My Dad was a photographer so we always had new and spent flash bulbs lying around. That Magicube packaging really brings me back.

[@timothydigiuseppe1753]

Your narrative coupled with the images during the testing of the two types of flash were fascinating. I have never seen the likes of this before. Well done and thank you!

[@WKfpv]

Gav singing na na na at the end, showing he's a fan of the channel was heartwarming.

[@vwestlife]

Press photographers from the era would often have burn marks on their legs from flash bulbs that accidentally went off in their pockets.

[@jkvdv4447]

The good ol days before liability lawsuits

[@mar4kl]

I did not know that. But how did flashbulbs accidentally go off in their pockets unless they had pockets big enough to carry pre-loaded flash units with the power source connected? Only the Magicubes had self-powered detonators. Flash bulbs and regular Flashcubes needed an external power source.

[@vwestlife]

@@mar4kl Static charge from wool fabric.

[@ichtyorniscretace9624]

Can you please source this? I can't find anything talking about that

[@mar4kl]

@@vwestlife, wow, I never would have thought of that (and apparently they didn't, either😬), but it makes sense.

[@aronkogler]

This is one of the quietest video from slow mo guys at the event of experiment, and i loved it. It's actually like an ASMR, but way more satisfying

[@sandro-here]

I'd thought that this channel is already perfect until I saw this video. This is next level, absolutely stunning! You did it again Alec, thank you for a lovely 30 minutes of awe!

[@davidroddini1512]

Love the part at 33:31 “You’d still need to carry this and a box of crap” 😂

[@111111222223]

That had me rolling xD

[@Hans-gb4mv]

That's one thing I don't remember packing ...

[@bmxerkrantz]

hobbies in a nut shell

[@LittleDancerByGrace]

Is he wrong, though? 😛

[@jamesarthurreed]

I always carry a box of crap with me. I'm relatively confident in my ability to acquire an adequate supply over time, but I never know when I might not be able to produce the immediately required amount on demand....

[@BEM684]

Congratulations on flashing thousands of people and not even getting a content strike.

[@newq]

Yep. That's it. I don't have to leave my obligatory Patreon comment now. This one beats anything I could possibly come up with.

[@quantumblur_3145]

​@@newqyou're nothing in comparison

[@FFKonoko]

​@@quantumblur_3145 what even is your Comment?

[@quantumblur_3145]

@@FFKonoko I could ask the same thing about what I replied to.

[@JacobZorio]

This is one of my favorite channels. I learn so much from your videos. Thank you for everything you do.

[@pherja]

That was just insane. The way the process kept unfolding…. One of my favorite TCs to date!

[@startiger2]

Out of college, I worked for an aerospace company. The plant started during WWII as a small/medium caliber ammo producer. After the war, they got into other things. During the 50's and 60's, they had a contract to make flash bulbs for Kodak. They converted one of the buildings they used to make .50 cal rounds into a mechanically controlled automated flashbulb line. The line was not overly safe or reliable. When you are working with molten glass, primer, high o2 levels, and a lot of other things that burn really well, there were a lot of fires on that line. Somehow that managed to turn a profit until the 70's when they finally took the line out. Somehow they managed to keep a descent safety record and not burn the building down, despite many fires on the production line over the years. They actually had some of the equipment in storage into the late 2000's because they couldn't scrap it due to contracts with Kodak. No one wanted to even attempt recommissioning that line. It would never fly with modern safety and quality control standards for handling explosives. It would have required a total redesign of the process. Eventually, they finally decontaminated and scraped the equipment when Kodak went under in 2012.

[@m1goodwin]

Was this the Montoursville PA Sylvania plant? They made proximity fuses for WWII, then radio tubes, then light bulbs and flashcubes.

[@lukeonuke]

@@m1goodwin what a set of things that sound totaly unconnected but when you think about it have a lot in common

[@timprussell]

Amazing thing was Kodak engineer invented the digital camera in the 1970's but they were never a leader there. I guess when your business model is selling film you don't introduce a product to undermine it. They are a shell of their former selves today post-bankruptcy but still supplying film, chemicals etc.

[@sylvainmichaud2262]

When I was about 10 years old, we used these _flashcubes_ on a Kodak Instamic 60. I come from a poor family. The camera was a gift and we were very, very selective as to when we took a picture. We couldn't really afford the films, the processing and the _flashcubes._ So basically, taking pictures in a very small number was limited mostly to Christmas parties and special events such as weddings. Forget birthdays ! We were five children so it was too expensive. That meant that sometimes, it would take more than a year (multiple events) to get the pictures. That's what being poor seemed like back then.

[@Subiromba]

I think this is the biggest difference between film and digital: when we used film we just waited for the best moments and opportunities to take a picture, it was something really special, from a moment you really want to save for your whole life. Film and development were expensive and limited, so we didn't want to waste poses. Then digital came and photos became something easy, unlimited and trivial.

[@denisohbrien]

@@Subiromba while true, and i lived as such, i dont disagree with modern times, my daughter (5yrs) just took , i want to say abut 30 photos on her little digital camera just this afternoon, it has a thermal printer and she printed off 10 of them . had I had that opportunity as a child id have a lot more memories saved of dens projects and life in general.. hopefully she appreciates im collecting all these photos , and perhaps not her adolescence, but adulthood she can look back on them!

[@sylvainmichaud2262]

@@denisohbrien Still, today we tend to think that most people can afford a printer but most of all, the ink cartridges. It's not the case. The business model remains the same. Sell them one thing for cheap, a thing that requires regular use items that will become your main sources of incoming revenues. Anyway, I'll go get my cup of Nespresso freshly prepared with the help of Alexa and watch a poorly rated film, an Amazon Prime Exclusivity, on my Fire TV.

[@0neDoomedSpaceMarine]

@@Subiromba Phone cameras are often not that great, and photography remains a skill, thus why professional photographers never went away.

[@SteveDeHaven]

Two of my favorite KZbinrs, Alec and Gav! I was thinking, before Alec talked about it, how cool it would be to have the Slo-Mo Guys record these flash bulbs going off. One other thing, which Alec didn't mention: I remember the smell of those Magicubes. I enjoyed sniffing them. And regarding the temperature of the just-flashed single-use bulbs, I seem to recall stories of discarded flash bulbs starting wildfires.

[@RedKincaid]

Very happy to see my favorite educational KZbin channel when I was young collaborating with my favorite educational KZbin channel as an adult

[@blahfasel2000]

The gas in the bubbles is probably zirconium or zirconium dioxide (zirconia) vapor. When zirconium burns in pure oxygen it produces the hottest known metal fire, burning at an estimated 4930 Kelvin, well above the boiling point of zirconium (4650K) or zirconia (4300K). This extremely high flame temperature is why zirconium was chosen for the flashbulbs, because it's not only exceptionally bright but also needs only a little bit of help from a lightly blue tinted filter to match sunlight in colour temperature as well. Edit: BTW, the flame "sucking in" the unburnt zirconium wool is probably due to the high temperature as well. The zirconium near the advancing flame first melts, and surface tension then pulls in the still solid parts of the zirconium strands.

[@20chocsaday]

Hot but not as hot as the 6500K for a particular "illuminant". I wondered how a photo flash was going to equal the sun's 4watts per square metre arriving on Earth.

[@transendinghuman]

also the zirkonium dioxide is like 5 times denser than oxygen, so as it burns up from the inside out it probably creates a low pressure zone that sucks in the surrounding gas

[@blahfasel2000]

@@20chocsaday At sea level full sunlight is about 1000W/m^2, not 4W/m^2. But the key is that you don't have to illuminate the entire Earth. To illuminate 10 square meters to an equivalent level you need 10 kW. If you do that for the time that a flash lasts (around a thousandth of a second) the energy needed is only 10 J. That's not all that much.

[@Muonium1]

I was wondering about this unaddressed point in the video, because the blobs are VERY clearly *producing* significant amounts of gas as they burn, getting larger and popping in the weightlessness of freefall in exactly the same way as the molten blobs of Nighthawkinlight's senko hanabi fireworks, or astronaut Don Pettit's Alka Seltzer in water blob experiment on the space station. thx.

[@MartyFox]

I’ve been noticing for a while that Alec is “your favorite KZbinr’s favorite KZbinr.” Glad to see he’s benefiting from that!

[@vexx80000]

Begore slo-mo was even mentioned, I was wishing to see some Slo-mo Guys footage of some flash photography, so imagine my surprise when Gavin was introduced!

[@jeremiemiller35]

I love your videos, but this one really brings the nostalgia back of my childhood. I remember being so excited to use flash cubes and got in trouble for using up an entire box just for fun.

[@Yakkers]

The moment you started to imply slow motion I was like "please be a slow mo guys collab," I'm happy I wasn't let down

[@megumei044]

The shot at 30:52 is pure perfection with you lit up in the background!

[@redroyal4287]

was looking for this

[@RooneyMac]

That's EVERYONE'S favorite shot

[@MBroam]

A fascinating video. The slo mo clip of the uncovered filament going off with the out of focus sparks was just beautiful.

[@bloodvue]

Love how thorough you are, much appreciated

[@jxchamb]

This one made me feel old. It's like you're talking about something ancient but I remember these flash bulbs.

[@lapub.]

You don't only feel, you are (and so do I by the way) I remember my mum getting angry after me just because I took fun by triggering some electric type cube with a 4,5V battery !

[@davidpanton3192]

Mine watched in puzzlement @@lapub.

[@jfjoubertquebec]

I remember the smell!

[@kimchristensen3727]

It hurt when the slow mo guy said "I've never even heard of that" about a MagiCube.

[@0neDoomedSpaceMarine]

@@kimchristensen3727 I think I saw a flashcube once in an older episode of The Simpsons. Gotta say, while I never saw these things IRL in all my 31 years, I think their engineering is very clever and cool.

[@MichanaAlerting]

A collab that nobody ever asked for but EVERYBODY NEEDED. Thanks a ton Alec!!!

[@mralistair737]

I asked for it... don't remember in what context, but i asked.

[@nickbob2003]

When he said I’ll need some sort of slo mo guy I was expecting it to just be a joke

[@MontyTFox]

I remember Gav mentioning on a podcast a while back that he is a fan of Alec's channel and finally we have this

[@Blank_Redge]

Love what you guys did here. This is awesome stuff seeing this for the first time! Thanks for doing this.

[@nathanlee105]

why did I decide to watch a video about flashes on my 65 inch TV at night in the dark

[@TheOtherSlideYT]

This has to be one of the more unexpected, yet welcome crossover episodes 😆

[@mtnman7776]

THANKS for this video. 60 year old photographer here that used those flash bulbs, flash cubes, magic bulbs, 1960s Honeywell Xenon flash, apparently understood nothing of those single use bulbs like I thought I did.

[@stamasd8500]

54yo photographer here who never got to use the explody ones, because fancy-schmancy xenon tubes were already around. :)

[@MrDuncl]

@@stamasd8500 60 year old here whose first camera was a 126 used Magicubes. Once used I dismantled a few but never worked out how they worked. By the late 1970s I upgraded / downgraded to a 110 with a built in Xenon Flash. I would have to dig it out but think it used four AAA batteries to operate it.

[@0neDoomedSpaceMarine]

@@stamasd8500 See if you can scrounge up an old cheap one like in the video, and then a couple of cubes, see what it's like to use these. Not cutting edge anymore, but to make a comparison, it's still fun to shoot an old fashioned musket, even though they're antique technology. That they're such a different experience to modern guns makes them novel and interesting to try, some consider them far more fun and enjoyable.

[@jamesshepherd5222]

I don't know how you do it. The things that I grew up with and took for granted are really like freaking magic. Love your channel.

[@philc.2504]

The sound and bubbling of the press flash bulbs going off in Netflix's The Crown is one of my favourite aspects

[@nozzzzy]

Oh. My. God. I wish you could have seen the smile on my face when the scene cut to you and Gav. Legendary colab.

[@Dorraj]

SAME Him talking about slow mo I was like "no way it's Gav", then he said "slow mo guy" and I absolutely lost it haha

[@dimitri877]

My smile was so big I almost swallowed my own ears.

[@casualbird7671]

Same here it was so delightful!

[@LMacNeill]

I remember those Magicube flash-cubes from the '70s and early '80s when I was a kid. Man, those things were *SO* expensive!! You had to be very selective of what you took a picture of indoors, not only because you had a limited number of pictures on a roll of film, but also because you only ever seemed to have one of these Magicubes, and at least one of the flashes had already been used, if not 3 of them. LOL!

[@axelBr1]

I wonder how much in original money was spent making this episode

[@tjncooke]

What annoyed me about both my Magicube cameras was invariably, when inserting the flash unit, one would go off just by inserting. Not sure if it was my 4-7 year old fumbling, or a design fault. The flash sticks (not sure if that had a catchy name, but they had like 10 bulbs per stick), which used electricity, avoided this problem.

[@LMacNeill]

@@tjncooke Oh yeah -- my aunt had one of those cameras that used the flash stick (whatever it was called). I'd forgotten about that. They were definitely better than the MagiCubes, no doubt. I never had a MagiCube go off by accident, not that I can remember anyway. But I can totally see how it could happen -- just get anything up inside there, poke that wire, and **poof!** It'd probably have scared the shit out of me, had I done it. 😂

[@edmondmartinez9617]

Great so see a collaboration like that. Always interesting, and you were able to do it without going over the latent heat of vaporization.

[@SevenStarsAndHalf]

I remember those cubes ! That's fun. But most of all it's an AMAZING footage you got here. Bravo and thanks !

[@RonParker]

There was another competing system for 110 flash photography in the late seventies, maybe into the early eighties, called the "flip-flash." If I'm remembering correctly, it was basically a slab of plastic containing 10 small flash bulbs, and five of them were wired to a connector on each end of the slab. Once you'd gone through the five at one end, you flipped it over and used the five at the other end. What I never managed to figure out from tearing apart my mother's used flip-flash units was how the camera fired only one, and how it chose which one to fire. I've always assumed that the heat of the flash either created or destroyed some sort of electrical link, but it'd be really interesting to find out for sure, once and for all.

[@whitslack]

Yes! I remember this as well, though I had forgotten that it was two-sided. I always wanted to know the same thing: how was it designed such that only the *next* unused bulb would be fired? I wonder if it was mechanical like the Magicube or some kind of electrical circuit cleverness.

[@eDoc2020]

It's 2024, we have the Internet. I did a quick search for Flip-flash and got the answers. The thermal events disconnect the spent bulb and wire in the next. It's easy enough to break a circuit with heat but making a connection is more interesting. It's described in patent US3458270A.

[@hebneh]

I'd forgotten about these, but now remember after reading your description.

[@j_taylor]

We had those for our Polaroid! Wasn't the number of flashes in the stick different from the number of photos in the pack of film?

[@RonParker]

@@j_taylor It was definitely different from the number of exposures in a 110 film cartridge, which I recall being the standard 12 or 24 exposures. But of course, you didn't always want to use the flash, so they probably weren't going to match up anyway.

[@Zaurthur]

32:07 If anyone is wondering why they couldn't just run a current through the zirconium, the issue is zirconiums resistance and available battery power. Its resistance is x8 higher than tungsten you can't push any current across it with an amount of volts you'd be comfortable lugging around and no current means no heat.

[@mandi8345]

Tangential fun fact: most flashlights that take 3 AAAs in those little round holders dont even have current limiting resistors in them to protect the LEDs. They rely on the relatively slow chemical reaction to limit the current available to the LED array. Also, if you want a brighter light, just pop a lithium battery in! I use a 14mm by 48mm (50mm including button contact on top...whatever that translates to in battery dimensions....14480? 14500?) harvested from a cheap wireless mouse that is the perfect length, and some spacer rings cut from a paper towel tube to keep it centered. ....though I do recommend adding a resistor if you go that route as you can burn out the LEDs a lot faster with the kinds of current a lithium battery can instantaneously provide....

[@PMARC14]

I mean it is kind of pointless, a decent rechargeable flashlight with replaceable lithium battery can be had for 10 dollars if you know what to look for.@@mandi8345

[@RandomGeometryDashStuff]

@@mandi8345your cheap wireless mouse had a built-in lithium battery? all wireless mice I seen have slot for AA battery

[@reinhard8053]

@@mandi8345 I discovered it the bad way. I bought a quite bright used LED underwater flashlight with alkaline batteries inside (~10W) without manual(!). Then I changed to NiMh batteries and it didn't last long because it just burned up the LED which was directly connected to the batteries. No electronics, no resistor. Older flashlights and cameras with flashlights sometimes had a warning in the manual that you MUST NOT use rechargable batteries.

[@EthanTrewhitt]

28:32 looks like the intro to a film company logo at the start of a movie. BTW, I always enjoy your videos but I've been busy and had procrastinated watching this one. My loss. It was fantastic! Love seeing you work with another great KZbinr.

[@joschi4148]

Your content is absolutely priceless: fascinating, entertaining, very well done, educational, ... just awesome!!

[@selkiemaine]

Thank you for bringing back my childhood! We LOVED macicubes. Neither of my parents was mechanical enough to handle batteries in a camera, and I can attest to the reliability of these. They simply worked. But, oh yes, were we careful. When we'd have a party, we'd probably take 4-8 flash photos. That was all we wanted to pay for. My father had an SX-70 polaroid - that thing had a 10 bulb flash strip. Make no mistake - a magicube WOULD burn you if you grabbed it right off, but those 10 bulb strips were worse. They got HOT. They used to melt and bulge all over the place. But, again, they were reliable. And, I've got the "deer in the headlights" pictures of our '70s parties to prove it! I remember that, when I purchased my first electronic flash, I was so fascinated that I went through a full set of batteries just making it do its thing. LOL

[@johnsimpson8263]

I had forgotten about those 10 bulb strips. And yes - they did get awfully hot.

[@CorporateZombi]

The flash gun charge cycle noise was an iconic sound of my childhood.

[@robson668]

Yeah very nostalgic to see these again, beautiful pieces of tech.

[@efx200z7]

I also have one of those bars for a Polaroid 2000. What I don't really understand is how the camera (or the bar itself) knows what bulb is set to fire, since there are five on each side?

[@MonkeyJedi99]

Would you say that the Magicube greatly increased camera use by people? Or say, caused EXPLOSIVE growth?

[@stanleydenning]

As a 62-year-old man, I remember the flashbulbs of the ancient past. Thank you very much for reminding me how freaking old I am.

[@flybobbie1449]

Thought you could remember gun powder flash granddad! I'm same age..

[@fabianmckenna8197]

Ah yes...... memories of melted flesh as you tried to change your flashbulb too quickly before it cooled!

[@clayz1]

Im older than you, but the age ratio just keeps getting smaller. You never really catch up though.

[@BertGrink]

@@clayz1It's like Xeno's Paradox.

[@clayz1]

@@BertGrink Like if you have two boats you need a pair of docs?

[@maddie9602]

Knowing how expensive photography used to be, it's crazy to think that grandma's photo album probably cost hundreds of dollars to assemble

[@kodymcpheron5619]

Your awesome, been waiting on the flashtube video!

[@julius3327]

What a lovely Agfa T-shirt ! For anyone wondering, it was designed by Swiss poster artist Herbert Leupin back in 1956.

[@jimwoodard64]

Someone my age or older might have reminded you that the explosion is how they took pictures in the 1800's and why there are photos of even President Lincoln that exist. They would have a pile of flash powder on a device that was controlled by the photographer who would hide under a protective blanket of sorts while the shot was taken. People would have to hold perfectly still because the camera would get a blurry shot if you moved at all during the process. I'm old enough to have lived through the use of all of the products you showed, and since my family was poor, we relied on natural light most of the time. We had cameras that used both types of these flashes, and I remember when we saw commercials for the new Magicubes released in the early 70's. It was amazing, and I even owned one. Those cameras were cheap as they were a loss leader for Kodak and Polaroid so we could take photos in low light. Polaroids were amazing to us too, because we didn't have to take the film to the local drug store to drop them off to get them a few days later. I never saw a fire started, but we would try to see who could hold a flash after it burned and for how long. They were freaking hot! Great video.

[@Murgoh]

The dark cloth ("blanket") is mainly not to protect the photographer but to keep any external light out to allow him to see the rather dim (and upside down and mirrored) image on the ground glass focusing screen to focus and compose the shot. When the composing and focusing is done the photographer would put a film or plate in a light tight holder in place either replacing the ground glass or moving it back so the film will be in the same plane. He would then close the shutter or on very early cameras put on the lens cover, remove the dark slide (a light tight piece of sheet metal covering the film when the holder is out of the camera) from the film/plate holder, open the shutter or remove the lens cover (a hat or something similar could also be used), fire the flash, close the shutter/lens cover, replace the dark slide and remove the holder. Photographer taking a picture while being under the dark cloth is a modern misconception, usually they were (and still are, one of my hobbies is large format photography so I have done "the dance" many times myself) outside of the dark cloth at the side of the camera when actually taking the photograph as they would not see anything at that stage anyway with the film taking the place of the focusing screen. You don't want to be touching the camera during the exposure so you'll stand clear of it.

[@TryAlex23]

I ain't reading all'at 🙏💀

[@railgap]

@@TryAlex23 it's so weird to me that some people seem proud of being functionally illiterate, so they actually brag about it.

[@TryAlex23]

@@railgap ok

[@kaitlyn__L]

@@TryAlex23you gotta admit, the “I ain’t reading all that” threshold has gone down from like 10+ paragraphs to just 2. Heck, one of them doesn’t even fill my phone screen and it’s a pretty small phone.

[@MrSpathiphyllum]

Great slo-mo shots! I remember being photographed with some sort of flip flash still in the 80's.

[@TwZlr.]

YES!!! I'm so glad you guys got together on this one!

[@lancista91]

Old school photography and timekeeping just endlessly fascinate me. So many cool electro-mechanical solutions to problems that you can do today with a micro-controller.

[@akulkis]

Also a lot of ELEGANCE in those mechanisms. Getting slide film (positive image) in a photochemical structure which is fundamentally creating a negative image is even more interesting. Also, you can develop slide film as a negative and get a negative image just like as with traditional negative film, but with a slightly different color balance (which would be corrected for in the printing dark room, because the slide film base is clear, whereas film made to produce negatives is built on an orange base, so printing negative-developed slide film requires dialing in the LOT of orange before it's close to the right filtration to get a proper-looking positive print)

[@dannileigh6426]

Very neat things indeed, such interesting designs and problem solving! Also re @akulkis I really liked cross-processing techniques. My friend is trying to build a darkroom in their new home. I'm definitely looking forward to playing with dark room processing techniques again!

[@PierreAlainMaire]

According to US patent US3312085A the primer could be "a mechanical mixture of finely divided zirconium powder, of above-described grain size, lead dioxide up to 35% by weight and about 2% by weight of polyvinyl alcohol. Potassium perchlorate may be substituted for or included with the lead dioxide". Yummy. Thanks for the video. Those slo-mo images are wonderful ! True joy to understand now those cubes I was playing with as a child.

[@jpdemer5]

That's an electrically-driven primer, and not the flash tube used in the Magicube. All of the patents related to the Magicube discuss "recently developed" "percussivelly-activated" flash bulbs as if they were an off-the-shelf item. I'm guessing that they were unable to patent the bulb itself.

[@PierreAlainMaire]

@@jpdemer5 yep, as he said the Magicube probably uses some gun powder. I was looking for the composition of the "primer beads" around the filament in the non-magic bulb.

[@jpdemer5]

@@PierreAlainMaire Almost certainly lead styphnate as the shock-sensitive inintiator, and probably powdered zirconium to supply the flying sparks.

[@TheRealMattKronik]

Really well done on the slo-mo footage! I feel like that's only something I would've been able to see watching Nova on PBS as a kid

[@odnetnin4720]

This is pretty damn cool. Thank you for all your work in bringing it to us.

[@theAessaya]

I'd like to point out that the blue translucent coating on the flashbulb does not _add_ blue, it removes some of reds and yellows and greens instead! For it to add blue the backing light need to be in the UV/xray spectra, so it can re-emit those photons at lower energy level (fluorescence).

[@TeriWilde]

Just out of interest, the blue coating on the bulb is to filter out the brown of the tungsten light. I remember when I started photography with a Kodak Brownie 127 back in the 70s and I used many of the Flash Cubes. I progress up to Hanimex 110 and eventually a high end 35mm SLR. I had to use a blue Cokin lens filter to correct the browning of photos under tungsten lighting, and a pink lens filter to correct the greening of photos under florescent lighting. We used to use Flash to eliminate shadows, but the more modern HiD flash would wash out a lot of indoor photos. I absolutely loved photography and I've never got the feel of a digital camera, so I slowly faded away from photography. I still see my photos that I took in the early 90s being published. This video really brought back good memories. Thank You Alex 👍

[@NotATube]

The Magicubes I remember using- and, from what I can see, the ones in the video- didn't have or need the blue colour-correction coating on the bulbs. I'm sure I read why that was somewhere, IIRC it was because they changed to a different metal that burned with a bluer light.

[@davelowets]

The coating on exposed flash bulbs HAD to be there to keep the glass bulbs from exploding and sending shrapnel into people's faces. And yes, it was a blue tint to help correct the color. The Magic Cube bulbs were enclosed inside the plastic box, if one did explode, it would be contained behind the clear plastic lens. The magic cubes probably did have a different color temperature also, because they were a purely mechanical device. They didn't use electricity to fire off the fine "steel wool" inside of the bulb. They used a type of percussion cap inside that when struck with the firing pin of the camera, would set off a tiny "explosion" inside the bulb.

[@jst7714]

Film photography is having a second wave! We would like you back in the game!

[@pandorasflame7742]

You sound like my mother (in a good way). She was a professional photographer from the 70s to the 90s.

[@TheOnlyDamien]

Any chance you could talk about some of the photos you still see around being published? Would be cool to check out your old work! Thank you for the insight as well!

[@jp040759]

VERY FRICKEN COOOOOOL. I was totally unaware of any of these technologies. GREAT topic. Thanx to Slo Mo guy also for the incredible view into this world of Chemo-Mechanical flash.

[@volrath__]

I am so gutted I am late to this one! Seeing you and Gavin work together is epic!