The World's Worst Invisible Ink

[@filnn]

"We shouldn't be trusted with fire," Says the man that is an authority on handling fire.

[@Connor-hl4fc]

The man that literally wrote the book on fire eating immediately set the paper on fire. Twice.

[@angelemmanuelperezmuniz1474]

The funny thing is he knows how not to get burned but he doesn't know how to control it on other stuff that isn't him.

[@NoadiArt]

Exactly my thoughts

[@SkylerDraike]

@@angelemmanuelperezmuniz1474 So, he should write the message on himself?

[@angelemmanuelperezmuniz1474]

@@SkylerDraike No, he should learn the heat tolerance of other stuff other than himself. That way he's skills of fire manipulation can be expanded.

[@EightsofSpades]

Brian in the revolutionary war: Have him send another secret message I burned this one

[@dr.blauerkraut]

"starting a fire S T A R T I N G A F I R E" *Covers fire with paper* Fire: "understandable have a great day"

[@yetanother9127]

I mean, it worked. No oxygen means no fire. Brian, of all people, definitely knows this.

[@asher8085]

@@yetanother9127 I knew it would work bc of the “no oxygen, no fire” fact but it was still freaking hilarious 😂😂who in the hell fights a fire with more fuel?!?!

[@kyesickhead7008]

SCIENCE!

[@aidanquiett668]

@@asher8085 Firefighters actually. H2O is after all 2 parts O, and oxygen is both a fuel source and part of the fire triangle. It actually becomes a huge issue when they fight fires in oxygen deprived environments, like was shown in the modern rogue barn fire episode

[@spencerbrotherson9061]

@SidtheKid actually, if i've seen someone put out a cigarette in gasoline. A guy i worked for a long time ago used to do it to freak people out. The liquid itself isn't that flammable as long as it's not hot and it's not aerosolized... the vapors are super flammable if you let it evaporate in an enclosed space so i wouldn't try it in your garage (honestly, i wouldn't recommend trying it at all), but it can be done

[@stapuft]

use an old school incandescent lightbulb. they get hot enough to blacken receipt paper (thermal activated ink) so it would 100% get hot enough to reveal lemon juice.

[@esmecat]

light bulb was what we used when i was a kid, mhm.

[@thefierypaladin126]

You could also microwave it (haven’t tested)

[@jamesahibbard]

I was always told you could use a hot iron.

[@ComradePhoenix]

It also gets hot enough to seriously burn yourself (source: I burned myself with one as a kid).

[@stapuft]

@@ComradePhoenix truth, bit even so, it would take, ALOT of idiocy\bad luck to burn the paper, and your house down than using an open flame though. LOL

[@paulmann1289]

In preparing the pen you missed on VITAL step - drying the innards before trying to fill it with another liquid

[@JD2jr.]

Coulda used that oven earlier.

[@Qermaq]

Prob wouldn't matter much. The nib is all they needed for this and it didn't work great.

[@woodytheskip1718]

When I saw the intro and having heard it works I kinda expected it to be written in gentleman juice.

[@ShugoAWay]

It does work but the smell give away what is on the paper so not that hidden

[@mkhmmdaziz]

that's actually what i also think

[@jackyu8434]

I didn't even know that was possible lol, but I still assumed it

[@MuscarV2]

@@jackyu8434 anyone that doesn't understand that's possible is immensely stupid. They say "any organic liquid", so that obviously works.

[@jackyu8434]

@@MuscarV2 lol, I knew about the lemon juice, but didn't know u could do it with any organic liquid before, and, the 'any organic liquid' was only covered after the intro

[@loganeasley4343]

“Didn’t people do this during the Revolutionary War?” No Brian, that was Nicholas Cage in National Treasure.

[@seththetechguy]

Haha!

[@ArKamMLG]

I was just about to make a comment about this but decided to see if anyone beat me to it.

[@Antaios632]

LOL was going to make this comment myself!

[@TestarossaF110]

HAHAHAH!!! hhahahahahaa.... haha!!!! ha!!!!!!!

[@jincyquones]

It's true though. Spies for both the Americans and British used invisible inks, including lemon juice.

[@kirkskywalker1701]

The following message will self destruct . . . Mostly because Brian will burn it while he tried to read it.

[@The_world_is_not_worthy_of_Him]

quite literally the opposite of self destruction if someone else destroys it.

[@erazn9077]

“Burn after reading” or before...you know, whichever way works

[@EpicBlader79]

Next episode: "The Modern Rogue Steals the Declaration of Independence"

[@nullpwn]

they don't have the guts

[@OverlordMMM]

"....and accidentally set it on fire."

[@MuscarV2]

@@nullpwn They do, you're just a pessimistic dummy. They'd make a really involved plan, and then fail at every step in a way that they somehow actually succeed, only to accidentally destroy it in more than one way at once as soon as they've got it.

[@Dant3J0n3s]

Days since Brian set something on fire: *0*

[@yetanother9127]

Usually, when Brian sets something on fire, he's doing it deliberately . . .

[@WeirdPros]

These guys have an extensive business, multiple channels, a website, merch and a headquarters. But they still aren't above making "two bros in the kitchen do a science" vids. Respect.

[@opaldoesmagic]

Brian, you've been a mentor for me for the past 8 years and appreciate everything you do. My condolences go out to you and your family. May Jay rest in peace. He will be missed.

[@TheMijman]

What happened?

[@yordlejay6820]

@@TheMijman his brother died

[@angelemmanuelperezmuniz1474]

Was that the fat and funny guy that appeared in some Scam School episodes?

[@heavens.sorrow]

Holy shit. :(

[@Arcanefungus]

"This message will destroy itself after reading. Or before If Brian does it..."

[@SD18-videos]

Brian: “I eat fire” Also Brian: “ I can’t not light things on fire”

[@dawnthegoblin]

It's a blessing and a curse

[@RaptorJesus]

I mean why else would he eat fire? It's a matter of survival, man would starve otherwise.

[@Metalhammer1993]

Brian don't worry, I too got earlier to the Book "Fahrenheit 451" than remembering that it is the flame point of paper(which gives the book the title)^^ So kudos to Jason for that joke. And I just KNEW what the other Chemical would be.

[@richbuilds_com]

Knowing my WW2 history, I was convinced the last was was going to be sperm. The reveal was a relief :D

[@acdi33]

ah yes, pee. the choice ink of the pen15 club.

[@zaxtonhong3958]

It all comes full circle

[@realelaverick]

That was actually less repulsive than I thought it was going to be. Sir Mansfield Cumming (the founder of MI6 in the UK) advised male spies to write invisible correspondence using their semen, stating that "every man has his own stylo". Regardless of the medium though, it'll be a brave person who tries to cook cheese on toast at the MR HQ.

[@TheRealAlpha2]

Ahh, so _that's_ where the word... is from. (it probably isn't and hilariously coincidental)

[@farmerboy916]

And every woman her own ink-pot.

[@JonathanPaulin]

Leave the heat source on the damn table and only move the paper!!

[@davidonfim2381]

For being a fire eater who literally wrote the book on fire eating, Brian really doesn't seem to have a clue how fire works.

[@samshaffer2250]

In his defense, he's good at setting things on fire and putting them out and that's what you need for fire eating Can't eat it without setting it

[@jonahcraven8669]

7:50 We shouldn't be trusted with fire... This from the man who literally wrote the book on fire eating.

[@danielamador5932]

That revelation about highlighters really rocked me.

[@viktorivia]

Hi Brian, so sorry to hear about Jay. I know how much it hurts to lose a family member, but i cannot imagine how it must be to lose ones sibling. My deepest condolences.

[@Kaepsele337]

You could use those frixxion pens in reverse. You can erase them with heat, but if you put it in the freezer, the ink comes back.

[@jasonknight1085]

Bottled lemon juice has typically already oxidized, giving it a different chemical structure. More citric acid, less ascorbic acid (vitamin C), etc, etc. Might be why it was so hard for you to get to work as I'd think heat and oxidation would be part of how this is supposed to work. If it's already oxidized...

[@mr.maskss5745]

There's an invisible ink for fountain pens called "noodlers blue ghost"

[@sam-qv4vr]

open fire seems unnecessary when they could've used like, a hair dryer

[@Just_Sara]

Or a heat gun. Or held it over a toaster. Or a light bulb.

[@atomic_preacher4333]

Soldiers during WW1 or 2 used semen to write hidden messages but failed miserably due to the smell This has been fun facts with iron_elm

[@atomic_preacher4333]

@Andrew Harper it could be, I honestly don’t remember and who needs research when the comments will correct me

[@asher8085]

Thanks I hate you

[@the___dude]

You made me believe in Jesus Christ again

[@26CW128Jake]

I read this before finishing the episode. After watching Brian freak out, I was convinced Jason had written the last message with his love juice.

[@PersonOfRandomnesss]

Were they a part of the Pen15 club?

[@tomleech9753]

Every book I've said use an iron. Every book. Ever. Did you guys not read the same books as me? :)

[@PersonOfRandomnesss]

You haven't read all the books about invisible ink then. Most of mine said a lighter or Bensen burner, one saying gas stove top. I've only read about an iron in one place, but in my experience a light bulb is by far the best.

[@bretlemieux2489]

You could use a muffler as well if you really want to it gets hot enough for any thing

[@dawnthegoblin]

I was always told to use a toaster.

[@thefierypaladin126]

Does a micro wave work?

[@bretlemieux2489]

@@thefierypaladin126 no it dose not heat the same way unfortunately

[@metagrazer]

You threaten to release their full 30 minute "podcast" but that's exactly what I want!

[@kuraiwolf4047]

I always used a lightbulb to heat the page. Less likely to set it on fire, as long as you don't touch the bulb with the paper.

[@MarcSiqueira]

I was once demostrated this when i was a child and the way my grampa revealed the hidden message was using a cloth iron, way easier, safer and efficient on that job (no risk of seting the paper of fire hahaha). Also, that was his way of teaching me a trick for that year's christmas, since he used to hide the gifts around the house and i had to go treasure hunting. Those were great days and i leave the suggestion, maybe you guys can have fun with josie doing this

[@markmallred]

Children of the Quorn would be pretty funny; not sure if you get it under that brand name in the US but Quorn’s a vegetarian meat substitute made from mushrooms. Actually that seemed funnier before I wrote it down.

[@msclrhd]

The NordVPN instructions were unclear. I've wrapped my router in toilet paper and flushed the network cable down the toilet. Can you clarify what I should be doing instead?

[@Thearmorer89]

I am SO RELIEVED that it was pee and not what I was expecting going into this! You all had me worried!

[@danelisslow3269]

Pee is still kinda gross...

[@Thearmorer89]

Considering what other products can be used... this is a much better option

[@yiminghuang581]

1:18 Brian: -*Writes book of fire eating safety* Also Brian: -*starts fire* -*proceed to put more paper on fire*

[@abhiramsankaras1026]

Jason and Brian - uses a spirit burner and an oven Me - " you guys do know there's something called a flatiron... right?"

[@KillerSpud]

Fun to see that the tool stand I made you guys finally snuck into a video.

[@THECRUELTITAN]

Hey guys. Next time. Use an iron for clothes to reveal invisible ink. Sincerely: every prop Dungeon Master

[@dearkota]

The man who handles fire for a living, sets paper on fire immediately....gee, who would have seen that coming

[@The_world_is_not_worthy_of_Him]

This man really blew at the fire to put it out, then went and put more flammable material on top.

[@NeelTheSphynx]

Every time you open an oven like that you remove 25° of temperature and that tiny toaster oven is probably way more. Especially slamming the door back and forth just pulling hot air out and throwing cold in.

[@robertlang4955]

When I was a kid, lemon juice or milk was our choice of "invisible" ink.

[@739redrose]

There are special inks that glow under UV light. For example, I use Noodler's Blue Ghost ink in my fountain pen for taking notes in rental textbooks.

[@golden_left_nut2260]

Brian putting out fire with more paper sums up the whole channel

[@mattallurgical]

13:55 Damn guys, I was hoping that _The Modern Rogue_ would at least _mention_ Linux. You guys are like the paragons of hipster-cool! NordVPN is also totally compatible with Linux and has its own CLI, not to mention, you can even put it on most modern WiFi routers so you can protect your entire household while only using up _one_ of your _six_ devices! I've been using Nord from your sponsored link for almost the full 3 years now, and I'm just coming up on my renewal in the next few months! TOTALLY worth it.

[@KarlRoyale]

An old school NIB pen works the best Also try using a hot iron (without steam obviously) to reveal You can also refill a printer ink cartridge to print with lemon juice, that really works well just pour the juice through a coffee filter first

[@bretlemieux2489]

Much love to the Modern Rogue from a New Hampshire monster rogue.

[@arvindersingh8057]

You guys look awfully like the people in hacking the system I saw you guys first in hacking the system so happy I found you guys.

[@Anomalocaria]

2:12 lol that face. "i've got some juices for you later."

[@VVheeli]

This channel really is run by 7-year-olds and I live for it.

[@Habaralol]

I like the fact that they got an oven and waited 30 min instead of using an iron or a grill

[@ZGBrickfilms]

Not gonna lie, I really thought Jason was going to say he wrote the second message with a something from the same body part that could be decoded under a black light lmao! Great episode guys!

[@baylego]

I was 100% expecting that plot twist

[@pokermcafee]

"The yellow one" and "Less than 451" made my week

[@Maninawig]

7:44 "We shouldn't be trusted with fire" - the man who litterally wrote the book on fire safety.

[@kylemozisek4885]

At 4:30 ish did yall desaturate the video and made the highlighter more vibrant? Was it just the lighting? Or am I just going crazy? I need answers.

[@matthewdarocha8243]

Apparently you can soak some receipt paper in hot water and use the water as invisible ink that doesn't take as much heat to activate

[@SilientShadow]

Do none of you own a heat gun?

[@PyroPyrate]

We know for a fact that they do. They used one to make the PVC bow.

[@PoizenGamer]

Man I was scared for a second. I just got a new puppy, and the moment around 5:30 when Brian sat down and the chair made noise I was worried something was wrong with the dog. Great video though.

[@giorgiogroves]

The “Fahrenheit 451” reference was brilliant!

[@MrHelllllloooooo]

'We shouldn't be trusted with fire' Says the man who literally wrote the book on fire eating and is a professional fire eater.

[@asher8085]

I love how his first reaction when the paper caught on fire was to cover it with more paper😂😂😂😂classic Modern Rogue style

[@gloriouslumi]

Well, yeah. It doesn't matter what you cover a fire with as long as it isn't volatile. Smothering is smothering. Paper is non-volatile.

[@asher8085]

@@gloriouslumi yes very non-volatile until it catches on fire along with the other paper😂I get what you’re saying about smothering it but that shit was still way too funny lmao

[@gloriouslumi]

@@asher8085 That's like saying you shouldn't wrap someone on fire in blankets because fabric can catch fire. Fire requires three elements to exist: Oxygen, Fuel, and Heat. Eliminate any single one of those and you no longer have a fire. There was no way for the paper to catch fire because there was no oxygen between two sheets of paper laying flat on a table.

[@strixterlive]

Hey guys I love your stuff. I think you should try to do a collab with Greg from How to Drink. I feel like your personalities would mesh well.

[@pencestreams9103]

Def. but they have Trevor

[@archangel1547]

So, Brian started a fire with his message and his idea to put it out was to put more paper on top of it.

[@conordunne3831]

Using a clothes iron should provide enough heat without the joys of fire... But this is so much more fun!

[@hatorigirl1202]

I feel like we used an iron when I was little.

[@ehrichweiss]

A really good one is ALL(the name brand) laundry detergent. Get the clear stuff and write what you need. To see it you just need to turn on a black light.

[@MrCrazyGameGuy]

They do a dozen episodes on fire, and still haven't learned not to add OXYGEN to the equation, it's amazing.

[@MrAqr2598]

Induction burners also work with the heating.

[@Just_Sara]

Yet again, I've just spent this entire episode trying to take things out of your hands. I am very entertained by this, though.

[@catfish552]

The Modern Rogue experience in a nutshell.

[@neverdoubt11]

How does a man that shoves flaming sticks into his mouth panic that much at a burning piece of paper.

[@donna30044]

There are many inexpensive inks available that fluoresce under black light. Some are clear, but there are also tinted fluorescent tinted inks on the market.

[@ArktinenPeikko]

When I played with invisible inks as a kid, I just ironed all the pages. A bit more controllable and even =D

[@toribenita_kyo]

Mr. Brushwood, a trickster among rogues was he He spoke of secret messages and he did so joyfully A message from Mr. Murphy he did gladly receive 'Twas written with something he did not perceive And with sudden realization and a face of disgust He said, "Goddam*it, Murphy! Wash my hands, I must!"

[@thewhitebackground]

As rogues, I feel like you guys need to do most of the skills from “100 deadly skills”

[@Fenaughty]

Some weird box turned up in Sydney, Australia today. might search it with a blacklight to figure it out, or would that be a mistake?

[@therealbadboat5503]

You can use a lightbulb as a heat source instead of fire so you don't burn your messages

[@NothingPicksLocks]

Just FYI you can use a light bulb to heat the paper to avoid fire

[@legoobi-wankenobi3080]

My condolences to Brian and his family

[@Amcmidget]

U could also use a UV light to show the message written with lemon juice

[@killrade4434]

When we use to do this we would use a light bulb instead of a torchnand didnt catch fire; before led bulbs. Not sure if new led would make enough heat but worth a shot. I think milk works and try letting it dry for a long time before revealing.

[@HarshYadav-cj3yu]

So as such if you pee on roadside grass and burn them, you may see some pee lines. "The Message of Pee"

[@brutus2288]

I always thought the lemon juice brought out the invisible ink. Not be the invisible ink

[@elephantjesus7427]

Don’t you remember from scan school using erasable highlighter to do a Tiktaktoe magic trick, because I write hidden messages using those highlighters all the time

[@arthurdeleniq]

hat is the Lither tha he used at 0:55 ?

[@MrTupperAviation]

Get a fountain pen (maybe a platinum preppy or pilot Metropolitan - just something cheap) and load it with Noodler's blue ghost! It is a UV only invisible ink!!!

[@TheRamenSamurai]

that portable butane micro burner is awesome! ( I couldn't help but try to figure out what it was, I've never seen those before) it looks like he used the "Global Market" brand judging from the format of the little handle and the orientation of all the other bits and bobs on there

[@antiquatedspanner912]

A similar effect can be done by using tonic water containing quinine

[@sirflimflam]

I just watched a video for 15 minutes showcasing two people constantly failing to use invisible ink. What am I doing with my life?

[@andysnerdcorner6226]

I feel like this could have also been done with a hairdryer.

[@JonahBj]

What is the flame creation device you were using?

[@Maninawig]

Hey Brian, you know that the lemon juice trick works with both heat (fire) and backlighting, right?

[@richardpowell4281]

You mean the ink in The Pen of Greatness 😎 it's anything but invisible. Them crisp lines. (okay I don't own one YET but thought I'd give a free plug)

[@zakstinson6311]

I do own one & I love it! I use it for everything. I keep it with me pretty much all the time. Like 9 out of 10 times that I’m actually wearing pants, I keep it on my hip on the side of my multitool case. Highly recommend picking one up today!

[@dawnthegoblin]

Can confirm

[@thokk10289]

You should try erasable pen for this. Heat to invisablefy and freeze to reverse

[@GrumpyTy34er]

I'm sorry, "in elementary school, we all know that you can use lemon juice to write invisible messages????" What elementary school did you go to

[@seththetechguy]

Alternative title: Brian almost burning the house down

[@chisum8167]

Anyone know what kind of torch he was using?

[@duanebrimhall2556]

In "The Name of the Rose" Sean Connery's character used a candle to expose the hidden message. I think that lamp you were using was too much for the paper. RIP Sir Sean...

[@kokokoko344]

I thought the same, candle would have been better, less heat. And Name of the Rose is an amazing book!

[@TanyaHakala]

Is the surprise gift a roll of toilet paper? Because that would be hilarious in so, so many ways.