How To Test Circuit Boards For Precious Metals

[@amymckeny]

I have been watching your videos for several months now. You sir are amazing! Thank you so much for your time and videos. The education I have received from you is priceless. I knew very little about precious metals and the recovery and refining of them but it was something that has always been of great interest to me. I have been collecting precious metal scrap for quite a while. I have purchased everything needed for processing and refining. I have also built myself a proper room and work space with a hood for good ventilation. This is something I really enjoy doing. So once again thank you for the knowledge and the time and resources put into your videos. Please keep them coming my friend. ☺

[@sreetips]

Good to know, thank you. Please be careful.

[@scottlund4562]

You nailed the narration, I enjoyed it and had not a single issue listening as to your cadence, tone, or style. You held my interest throughout and I forgot I was listening on purpose. Very well done.

[@sreetips]

That's great feedback, thank you.

[@JustJeff62]

This is awesome brother!!! I was just looking at the 20 pounds of circuit boards that I want to test for gold and now I know exactly how to do it! Thank You! Thank you! Thank you!

[@simplifygardening]

Nice to hear you on your videos. You should do them all where your talking rather than text. great job well explained Tony

[@sreetips]

I've got a new high end graphics computer arriving today. I'll be able to add voice over the video from now on, hopefully.

[@simplifygardening]

Thats great I have been subbed to you for a couple of years. I have multiple channels myself but enjoy your videos as they are very informative. but the voice will help some people relate better

[@all_about-You]

This is the only guy to watch if your learning. the best.

[@brianlloyd8432]

Your processes and videos are amazing! Very cool and informative!

[@davidlee1719]

AWESOME!!! I finally had a method to ensure my Stannous was working properly since I had never made it. Put my 18K test solution on card fingers, then on a Q-tip, and used another Q-tip to put a small drop of my Stannous on the fluid from the card... = INSTANT BROWN. Good solution so my biggest test is now behind me! Thank you for this idea since I didn't have a way to ensure my stannous was good without first dissolving gold in a batch!

[@sreetips]

Cool!

[@davidlee1719]

So, I had some relays that were military grade relays. Golden color throughout, and with the Stannous method they showed brown/black color after surface test. Today, I put them in 60ml HCl, 20ml Peroxide 3% and before I even finished the peroxide addition the mixture was already turning greenish/golden in color. My figuring is that the base metal which was similar in color was copper. Does that sound correct? I had 8 grams of the relay arms, which I cut in half for the acid to get to middle layer.

[@davidlee1719]

This is just a trial run, not a serious one. Testing of methods. That is why there is such a small amount of material.

[@xdebugxDotNet]

Great video, glad to see you continuing to make new videos.

[@marsdenbalaska784]

Yeah buddy,a little louder wouldn't hurt but def. an awesome job!Better than my high school teachers in the 80's!

[@sreetips]

My wife said the same thing, to low. Adding narration increases the length of the video, but relieves the viewer of having to read and watch at the same time.

[@russellpindar7717]

It's good to see a video showing simple things like interpreting test responses. Schwerters in particular, I find a bit hard to "read". Thank-you.

[@shaneyork300]

Getting ready to try my first recovery of gold with vinegar and salt mix! I thought I'd watch this video before I do! Have a GREAT Day!!!

[@sreetips]

Shane, if you can, get one of those fine mesh nylon filters. Metal screen didn’t do to well.

[@shaneyork300]

I've seen this one before. I remember it well, I also liked it, which I do after I watch it all, but I have no comment and I always comment. Besides this statement that no one would care about. It was a very educational video, these are things I could start doing very soon. GREAT VIDEO!!!

[@calebbennington7322]

Great to see new videos coming up.. A quick question I hope you will answer where do you buy the better filters for your videos I have used coffee filters in the past But would like to get better ones. But there are so many types out there I mainly do gold refining.. Thank you.

[@sreetips]

I buy my lab grade filters on eBay. Thanks for looking.

[@codymcdiarmid7434]

Great video! Can I use muratic acid in place of hydrochloric ? I feel it's the same but unsure.

[@sreetips]

They the same

[@phillipbrewster6058]

where do you buy these solutions from.? Also where do you sell your scrap boards at a refinery or a complete board purchasing place what's the best place for large quantities of high gold content boards??

[@sreetips]

Phillip, I bought those boards on eBay. I'm not too much into the escrap scene. I only did this yo make the video. Escrap yields are just too low.

[@davidwolter4263]

Great narration I liked it very much!

[@sreetips]

My Windows 7 PC is 10 years old. It can't keep up with these gigantic video files. My new machine, arriving today, is an Intel Core i7 with 16GB ram, 4GB graphics card and 2TB hard drive will allow me to do some nice voice over video narrations. Trying to narrate as I shoot the video ends up making the videos too long. Thank you for the feedback.

[@jordanflati]

I have no experience in doing this, but I'm very curious. Why don't you incinerate the boards to extract the metals before chemically separating them?

[@charissevigneau4369]

After you refine the gold down what carat does it become? 22K?

[@sreetips]

24k

[@charissevigneau4369]

sreetips Thank you

[@Metal4Detecting]

Great video . Best wishes & Happy Stackin

[@helderfreitas6760]

I have a doubt on one board I got. It's the thir board I tested. Can you please tell me what you think, if it is gold or not? I don't know if the board is not gold of is the stannous solution was not well made, what is your opinion? The video is on my videos named gold test boards.

[@sreetips]

I looked at the video. It looks like you had a brown stain indicating gold in solution, but it was not vivid and conclusive. You need some standard test solutions to check you stannous chloride with. Measure out 0.1 gram of gold, dissolve in AR, denoxx, and add dilute HCl to 100ml level. This will give you a standard test solution of 1 gram of gold dissolved in 1 liter of liquid. You can then test your stannous chloride testing solution against a known standard and use it to compare the tests you did on these boards. I'll make a video to show how to do it.

[@MariaSpooon]

Would it be possible to do a video on, how to test for Rodium, Platinum, Paliadium etc.... please.

[@helderfreitas6760]

hi...excellent video once again. Can you please explain better what you use to test the silver? thank you

[@sreetips]

The silver test solution is about 1 gram of potassium dichromate dissolve in 25ml of 50/50 conc. nitric acid/distilled water. I'll make a video that shows how to make the test solution and how to use it properly. You can buy potassium dichromate on eBay.

[@malaysiagoldrecoveryandscr466]

one more nice video from u sir .. great ....

[@LuisRodriguez-xf9lv]

Thank you for another cheap way to test our e scrap. can you try the silver solution in ic chips on the legs specially those old eyeprom type rectangular chips. some of them look shining like silver plated legs. how to sort them from nickel or tin plated for silver recovery. and again thank for all those instructive for beguinners on e mining. Regards from Puerto Rico Island.

[@burnroe6611]

The old eproms ar silver platted even the inner part around the sillicon die is in most i have some with silver bond wires

[@livefreeanddonttread]

Awesome work man. I was just wondering, if the heat from the lamp caused the gold to react to the solution, why you didnt apply heat to the first solder unmasking? Did you already just know there wasnt gold in that area? And should heat be applied to each area tested? Thank you.

[@sreetips]

Heating is not necessary. The testing solution is acid. Cold acid reacts more slowly than warm acid. I heated the solution with the lamp to speed the process. I could have just as easily applied the test solution and waited for five minutes with no heat to achieve the same result.

[@livefreeanddonttread]

Cool man thank you. Keep up the sciencing!

[@libertadparasiempre809]

we can expect a layer of gold in a PCB card ? and if for example we have 1 Kg or PC Boards, how much copper we can recover ? and its worth it ?

[@sreetips]

I don't think so judging from my test.

[@helderfreitas6760]

i can't thank you enough...thank you very much

[@richs65treebucketservice24]

Purdy Neat How The SNCL2 Precipitate's the Au even when there is HNO3 Present....i have found most "Visible" Gold on Ewaste is about 6k...i ran into some Ram Spacers that were Yellow and they were Gold Under the Yellow insulate. And a Quarter Size Cpu out of one of the first portable Ausy made PC...Had 24k on it...A Good Test is Scratching a line onto something like the Bottom of a Dinner Plate Or Regular Jewlers Testing Stone...Ceramic Wall Tile would work...Now you can see the Scratch line Stay Or Dissapear...All the Soldering Joints should be 95/5 ..Lead Or 50/50 has pretty much been Outlawed...Silver in those Soldering Joints but A weak Amount...Also Antimity.....Everything but lead...One Feller was adding H2O2 To HNO3 And Dipping them to Remove all the Silver....Look's Like Fun.....Ha.....:)

[@sreetips]

Good stuff man.

[@woodguy76]

Why do you use the 18k solution specifically?

[@sreetips]

Because it’s stronger concentration.

[@woodguy76]

@@sreetips oh ok. I didn't know if there was more than that involved. I've been learning a lot from your videos. Thank you.

[@helderfreitas6760]

thank you... I will wait for that video

[@sreetips]

You can buy the test solution on eBay. It's the same thing as the solution that I use, only I make it myself. It comes in a small plastic bottle just like other test acids found in gold testing kits. The solution will look red or brown in color while in the bottle. It does lose effectiveness over time. That's why I make my own. I can add a little potassium dichromate and a squirt of nitric to rejuvenate it when it starts to give questionable results. I'll try to get a video of how I make mine out real soon.

[@Rpgamer50]

Thanks a lot ...more like this please

[@Chaosman88]

Thank you for the video, good explanation for beginners :)

[@charlesbennett6105]

What dose Stanis chloride solution consist of/ how is it made?

[@charlesbennett6105]

Never mind, I just found this video that you also made. m.kzbin.info/www/bejne/fquboJeIftanq7M P.S. I really enjoy watching your videos. Keep up the good work and have yourself a grate day. 😁

[@knnygar]

Why would they use expensive gold under the solder mask?

[@sreetips]

They wouldn't, but some folks think that they do. This video shows what really under there.

[@knnygar]

👍

[@kevinerickson2595]

like 93. I got a drop on my finger of test solution 14k and you want to wear gloves ,these test solutions are deceptively strong

[@sreetips]

It is nitric acid and hydrochloric acid. It will color fingers yellow at the very least. At worst it will burn your skin. I accidentally put my arm on a touch stone that had testing acid on it. I didn't notice it right away until it started burning. It caused a burn with blister and scab that lasted a week the size of a quarter on my fore arm.

[@burnroe6611]

Has anyone tested the satellite reciever boards i get them pretty frequently and they apear to have platting some more then other that seem to be alloyed

[@reformerworld5871]

I extract circuit but chek which metal & where contact

[@sreetips]

I don’t have much experience with circuit.

[@MuzikBike]

My school is forced to throw out electronics, and by that I mean legit landfill them. Not even allowed to scrap em. So much gold and copper wasted...

[@emilalmberg1096]

At last we will hear your voice!

[@sreetips]

I tried narration in the past but it made the video much longer. Sounded like I was rambling. Plus I hate videos where the author goes on and on while there's no action taking place in the video. I rehearsed this before doing the actual live shots so that I could use as few words as possible but still get the point across. Thanks for looking.

[@DonaldMelton]

i love watching your videos , but i would like you talking in them as well .btw great video . helps people to learn more about refining .

[@massimilianoilardi2749]

Ciao mi dici che oro sia questo perche di cono che e rame

[@christopherdangelo3965]

That verifies bingo

[@davidlee1719]

My question is, who are the same 2 or three haters who always Thumbs Down your videos??? LOL

[@sreetips]

I figure everyone is entitled to their opinion. I promptly delete any foul language though. I want it to be educational and believe that there are young people and ladies who may enjoy these videos, and the comments.

[@davidlee1719]

nice. Keep it up. :)

[@kevinerickson2595]

I'm pretty much sure I got test solution on my fingers from the test bottles. 10k I bet skin turned yellow ,then a day later the yellowed skin fell off after a hot shower..

[@um999out6]

great video, again!!! 😃. I learned so much from you, check.out my videos if you have time Id love your input! thanks

[@rodquillen4657]

This guy is color blind or he knows nothing about color. Copper turns green when oxygenation occurs. It is commonly known as a patina. Then you are color blind.

[@sreetips]

Copper in solution is blue. I look at it all day long.