Gold Recovery Electronic Scrap Gold Plated Pins
Вставка
- Опубліковано 28 лют 2016
- To contribute: paypal.me/sreetips?locale.x=e...
How to get pure gold from these pins. Gold and silver for sale on my eBay store user name is: sreetips (formerly bafelous) - Наука та технологія
Keep rocken sreetips, another great video!
Rick in Pantano, AZ. yes the ghost town
Absolutely fascinating! Thank you.
I enjoy these UA-cam short videos. I like your old ones for training, Please continue the educational side, the reactive series has surprises, I have enjoyed sharing your surprizes.
17 downvotes? I don't get it, how much more thorough could this guy be?
Really nice to find some of your videos that ive not seen yet
Another really interesting video. Thanks.
+sreetips finished product looked amazing just straight gold. great job!
Thanks for the comment.
@@sreetips Hello
I Hope You are well
I found your mail adress on UA-cam
Please what is the thickness of gold plating if this pins/connectors ?
please on 1 kilogram of pins and connectors gold plated with 1 μ(microns)
How much is the average yield of gold in gramms
Waiting for your Reply
Thank you
well done!! Very nice video for knowledge....Thanks Bro..
Would this process work for Gold plated connectors from PC Motherboards and such? Thx Also can Urea be used in lieu of Sulfamic Acid?
glad you started narrating your videos
glad you did this to show the and the cost.
It's fun to go back in time. The lack of Sreetips written on everything an not a word spoken and hearing the Darth Vader breathing is weird.
how do you treat the magnetic pins
Amazing 👏
I'm learning so much thank you
dude cool video I've been refining for like the past month and i saved all my little bb's of gold and melted them down, mine looks about like yours, so that gives me hope! alot more than I thought it weighed :D
+Corey Blanchard Congrats - good luck with your refining.
Just melt it out gold melts a higher temperature then led copper nickel so if you have shot gold jewelry just melt it out
In our plating shop, we have a big vat of techni strip 11 which strips the gold!
Agent Orange does the istripper flakre thr gold off or put jt in the solutions
when i worked on a military base, i would raid their construction dumpsters, because they would just throw this stuff out. i would turn around and sell it on ebay for really good money.
nice video, congratulations!
I also have a question, if you have on your nitric digest, metastanic acid, how do you deal with that?
+ovidiu anghel The best thing to do is incinerate. Put the foils in a flame proof melt dish, then heat to redness. Avoid melting. Upon heating the metastannic acid turns to a compound that does not dissolve well in acid, plus it can then be filtered out without gumming up the filter paper.
i love the videos would you be able to do a video where you recover the base metals like copper would love to see it
He does its called stock pot and treating the soultions with certain metals, if you want copper put in a piece of angle iron
sreetips Brother . You are proverbially, DA MAN !! Easily more than an accomplished beginner Sir 🙏⭐💯😎🌎
very cool bro thanks for the education one quick question how would a regular person like me get a hold of nitric acid like that?
Donald, getting nitric acid seems to be a problem for many. I buy mine from GFS chemical. But you must have a company name, and they won't ship to a residential address.
Thanks!
Good video!!
It would have been easier just to pan for gold in some random creek.
Yes and probably get more than that
SOrry this is the California gold rush
depends where you're located. You cant find gold just anywhere :D
Yea but if you got a kilo you make 300 bucks
We “pan” for gold at yard sales, thrift stores, resale shops, consignment stores. It’s everywhere. Silver too.
nice work
Thank you for your vids i always enjoy. I do have a question if you have time to answer. Do you use reverse electroplating on the magnetic pins or the same acid way? Most of the pins i have saved off p.c. boards are magnetic and i cant seem to find anything but reverse electroplating with sulfuric acid. Any suggestions? Thanks for any help and the greats info and vids .
Reverse plating in a sulfuric acid cell is the best way to go with gold plated items. Yes, magnetic pins will reverse plate quickly in the sulfuric acid stripping cell. As you can see in this video, it took a long time to get the base metals to dissolve. The mil-spec pins I used in this video would have de-plated in just minutes, instead of taking hours to dissolve base metals like it did in the video.
sreetips Thank you very much for the info. I didn't realize that's why it took longer in this vid. Thank you again and great job on your videos.
respect bro I'm not going to do all that for 7.4 grams of gold , it feels it it's was me doing and I have a headache
One quick question do you think it might be more cost effective to process these by reverse electroplating like in you earlier videos? Is that possible with the thicker gold plated pins?
+Caleb Bennington yes, these pins should deplate in the sulfuric acid stripping cell.
@@sreetips this process on your video will work on both magnetic and non-magnetic pins?
Mil Spec Pins are (in my opinion) the 2nd best ewaste item you can get. I think if I had someone hand me a kilo of it, I would be have 7.4grams is alot of gold! 👍👍
BUT after watching this vid I know I'd have alot of work to do!!😩
@@bettycarrigan331 Hi Terry, I've watched alot of vids since this one. I don't remember everything in it, so I'd have to rewatch it. I see I said 7.4 grams a kilo! Might have been something in the vid to make me calculate that number. If you want to do this yourself study up on it. These videos of Sreetips are very educational, I've watched everyone of them and when I start to refine I'll watch them again and take detailed notes, also there is a book that he recommends in a few of his vids (It's like a refiners bible)!! I know standard fully plated pins on average yield about 1gram per kilo of pins! However mil spec gold pins are a much heavier plated pins than your average ones. After hundreds of hours studying I think it's safe to say that you should expect 2 grams or more per kilo of pins!! Again I'd have to rewatch this vid to see why I put 7.4 grams. It might be that he got a high yield from a batch and I just did the math and got 7.4
I'll tag this video to rewatch, I don't know how soon that will be, but as soon as I do I'll give you my opinion again. Probably a little more accurate than this one!
Have a GREAT Day!!!
@@bettycarrigan331 Hi again Terri, I just watched again!! I was impressed with the yield. I remember now very well, this was probably the highest yield I've ever seen from gold pins of any kind!! 7.4 grams per kilo is alot! If you can get it for free!! Don't buy the scams online. I've never paid a penny for gold ewaste and very little on gas for vehicle. The way I learned about getting as much ewaste as you want (if the area you live in allows it) is watching "Ewaste Ben UA-cam" he has alot of info on getting ewaste!!! He also has an old video on how to start your own ewaste company! I highly recommend you to watch that, as well as keep watching Sreetips!!!
Nice!
Good proof of concept. I'm sure on a large enough scale this could prove profitable. Is it possible to recover/recycle any of the reagents (Nitric acid etc?)
The nitric gets completely consumed during the reaction. The only other metal is copper, and it's not worth the time and expense to try and recover and refine.
Insane man
Isnt there a simpler way? Like burning or boiling or some other less toxic way?
Even so. Not a bad yield.
Good vid, very informative. Thanks.
Quantum Leap
ALL THAT HARD WORK FOR JUST THAT?... DAM
lol,same reaction !
cristian lopez ym
I think this was just showing you the process I am sure he does huge batches of this .. but there is money in it if you have the time
Penny's add up! Gold adds up faster!
With more than 900.000 views, he certainly did not lose money on these :)
Very cool to watch. But how much money did you spend in chemicals and how much time did it take to recover a gold BB?
I refine karat gold as a hobby. I've got all the items and chemicals required to do this experiment. So I am all set up to do this kind of work. But it is very labor intensive, as you can see by the video. Recovering gold in this way is something I don't do very often. But it is a way to get some pure gold.
I like your video but will this method works for full plated gold pins?
I did this video to demonstrate a way to get the gold using dilute nitric to remove most of the base metals. But it took much more time and acid than I expected. The best way to process gold plated items is in a sulfuric acid stripping cell. I would not recommend the method used in this video, especially for someone who is a beginner.
tnx for video, i dont know why my aqua regia solution stay green even after percipating with smb , plz any solutions
After precipitation I always filter the gold powder out of the green liquid. Then, after rinsing the gold while it's still in the filter with a little hydrochloric acid, I dump the wet filter and the gold back into a clean beaker. I add some fresh hydrochloric acid, cover the beaker, and place it on low heat. Then I add just enough nitric acid to completely dissolve the gold a second time. The filter paper disintegrates and gets filtered out during the filtering process. After filtering I precipitate the gold a second time. This second refining really cleans the gold up nicely and gets rid of the green liquid completely.
SMASHING!
Why not just skip dissolving the base metal and use Aqua Regia to strip the pins of gold? Seems like it would minimize lost gold and save a bunch on chemicals.
+coldbluefire because the Aqua Regia would dissolve the base metals with the gold and cause problems. It's best to remove as much of the base metals as possible first. Actually the best way to recover the gold is a sulfuric acid stripping cell.
+sreetips Ah the power of Aqua Regia...I have much to learn, thx!
I think you had a base metal contamination in that dirty AR.
good
This is where watching skylanders got me
very good
A lot of work. But respect.
Good
im going to construct a sulphuric acid stripping cell, with stainless steel and copper mesh. does it matter how big the stainless steel sheet has to be?
+Raymond Reyes - I've never used stainless so I don't have any experience to offer. I used a lead cathode.
Hi sir how will the gold polish be done by recover the senate, please sir upload the video please
Invest in a glass distillation set or get a 1000ml retort and distill your own HNO3. KNO3 stump remover + H2SO4 drain cleaner and you will have a great supply of nitric acid.
I've got both and a distillation setup. I'll have to give this a try. Thank you.
so smart sir
This system is simpler and a whole lot less chemicals used and the waste is way cleaner
what do you do to the other pins that have tin or zinc or etc i used computer connector pins and have a white sediment at the bottom with my gold and am not sure what to do now
The sediment is probably a salt. Just let it settle completely for at least 24 hours, or until the liquid is crystal clear. It may take longer than 24 hours. Then use a piece of flexible PVC tubing and siphon off the clear liquid and leave the settled salts at the bottom. Gold plated pins are best deplated in a sulfuric acid stripping cell.
Could you use urea instead of sulfamic acid to neutralise the nitric acid?
There are those who have more experience than I who say that urea won't work to kill excess nitric, but I've used it in the past and it seems to work ok.
5lbs is 2267.96 grams. . I've noticed in a couple videos the math seems to be off a bit. still a great video!
I have 65 pounds + of these pins but some (very few) are the solder cup type and have solder on them. Would it be possible to leave them in the batch for processing or should I remove them because of the tin/lead?
I'll take them, but if not just some hot muriatic acid will work
Question: I have some Gold plated pins or appear to be gold and test with a basic gold test solution to be gold. They have solder on them from the circuit board. Would the best method to remove JUST the solder be a soak in JUST HCl for a while to remove the solder and get just clean pins for processing?
I think that will work. But you may have to scrape the solder off once the HCl loosens it up.
David Lee
Helo sir can we do this for earn money also or cost of experiment is equalant to cost of gold ?
through process you have done. i have processed the Cinch and Amphenol pins used in the circular male / female connectors. Some are rated at 30 micro inches of gold plate. " these ornamental, Decorative pins " i thought Not to be of such plating thickness.: i like your self am off, i routinely do get 0.25 of 1 percent by weight. some times, more, as pins can be 50 micro inches of gold plate, Circa 1965 / 78 . and even some colour coded ones, 75 micro inches of plating. Perhaps your throughness and good source of pins, gives you this good result. Admire the process, now let us find those gold pins. Cheers from Thomas GOLDBUYERca on the Forum
+Thomas Gx I thought these would in and out in an afternoon but they ended up taking me two days. Boy was I glad to see gold in solution, I thought I had done something wrong and made a mess.
يا صديقى اريد ان أعرف من أين أحصل على تلك الدبابيس، فى اى الأجهزة تكون موجودة ؟
ساعدنى لكى استطيع الحصول عليها
Nice bro👍
Good messages
kommidishivakrishna. reddy
God damn the more I watch the more I want ot do such things :(
hahaha same here
Do you smelt it all down? What was your final yield? Did you sell it?
+The Great one Smelting is a term used to describe extracting metals from ore. I have never done any smelting. I recovered the gold foils from the mil spec pins using hot dilute nitric acid to dissolve the base metals. Then I refined the gold to 24k using Aqua Regia to dissolve the gold foils, filtered out solids, then precipitated the pure gold from the solution with sodium metabisulfite.
I can't even pour myself a cup of coffee without spilling, attempting this would kill me in minutes.. Really enjoyable to watch though
Hi sreetips, please what should I do or what method should I use to separate the gold from the white paste or residue that is formed when processing with nitric acid? It is impossible to filter it. Thank you.
White paste? Tin metal dissolved in nitric acid will form metastannic acid, or tin paste. It will gum up a filter so that no liquid will flow through the filter. Sulfuric acid will dissolve metastannic acid, but it doesn't do it very well.
sreetips OK thanks
hello again, can you explain better the step with the silver testing solution? I didn´t understand it very well.thank you
+Helder Freitas I can't remember if I explained this yet to not, I did a test with silver testing solution and the color of the solution turned green indicating brass (alloy of zinc and copper). Blue would have been copper, plus I visually inspected and the metal under the gold, where I filed, was a gold color. Copper is pink looking, brass is gold looking. The visual inspection, lack of magnetic properties, plus the silver testing solution turning green (instead of blue) led me to conclude that the base metal was brass - a metal that dissolves easily in hot dilute nitric acid.
Good 🌷
How do you understand that the solution is saturated with base metals?
Base metals, such as copper or brass (brass is an alloy of copper and zinc), are under the coating of gold on these pins. Nitric acid will dissolve these base metals, leaving just the gold shells behind (because nitric acid, by itself, will not dissolve the gold). This is how I know that the solution is saturated with base metals.
Can we also do this process for pentium 4 processors? Because I happen to get quite a lot of base metal(Cu) in my final product.
I don't know because I've never tried to process them. I chose the Pentium Pro because of its relative high yield compared to other processors. However, I normally don't process this type of scrap because the yields are just too low. I only did it here to make the video.
Did I miss the spot in where you added sulfuric acid to drop the lead? Or did you not do it on this?
Maybe I forgot
So when exactly in that process would u normally add sulphuric acid to drop lead? And what like 2ml? Or so
When dissolving the gold I add 1/2 to 1ml sulfuric
Hello. what do you explore solution in 13.00 min films
I actually have some coming up to do. I think I am going to make an anode. Of copper zinc lead, tin. I melted about a dozen down and hit them with an xfr gun. I should plate out the copper on the cathode and leave zinc mostly in solution. And drop gold and a little lead. Drop the lead and then filter out chlorauric the precipitate. The sulphur cell I just need to big of a cell to be effective I'll try and make a video and go from there. Thanks for all your help getting me started.
+dekonfrost7 Nice! I'd really like to see your setup. I've never recovered gold with electricity. It will be something new and I am looking forward to learning about it.
+sreetips yea I've never done it either. I guess it will be called called an industrial scale experiment.
+dekonfrost7 Where did you get the idea to do the recovery by electrlytic process?
+sreetips the fact is I have a metallurgical background. Refining is an extension of that skill I have lot to process. I just want the au th cu and zn are waste to me. But ill wind up with like 500 bucks worth of cu that way. So for like 100 bucks worth of chemicals I'm done. Also I don't really bother with nitric to make Aqua Regis I just use a salt. It's very cheap and works pretty good. But it's incredibly easy to overshoot your need of nitration. Simple and easy is electrolysis
+dekonfrost7 look forward to seeing your process.
hello ... a question .. where you buy porcelain square containers? Thanks for uploading these videos ..
+gaggiouy I don't know, you might try ebay
which marks are the sources?
+gaggiouy I don't quite understand your question? Are you asking about markings on the pins? Thank you for your interest.
Hi sreetips! Can you give me your opinion? What you think about to plunge the pins directly in aqua regia and leaves them enough time to remove the gold plated? Obviously this will add a little amount of base metal within the gold, but maybe it can make the process faster, saving reagents and after that, the gold obtained can be refined by inquartation method. Thanks!
While this seems like a shortcut it will end up using more time and reagents. The main problem is this; the base metals are going to be copper or brass. The AR will dissolve the gold, but then, in accordance with the reactivity series of metals, the gold will immediately cement out as a gold powder onto the base metals - this will use much of the acids requiring additions of fresh acids to keep the reaction going. Eventually, after adding much acids to get everything to dissolve, the gold will no longer have anything to cement out onto and the gold will stay in solution. But the solution will be very dirty, full of base metals and chloride salts. Also, if there is any silver present, the HCl in the AR will react with the silver forming silver chloride. The basis of recovery and refining is to selectively removed impurities. That is why the first step is incineration to remove grease and oils, then dilute nitric to remove as much silver (if present) and base metals as possible. Then, when all that is left are gold foils (because dilute nitric will dissolve base metals but it won't dissolve the gold) then it is just a matter of dissolving the gold foils with AR or chlorine. The resulting chloroauric acid solution will be fairly clear and clean of base metals and should precipitate quite nicely. Dissolving the gold foils with chlorine will eliminate the need to denoxx the solution because there will be no nitrates to deal with, because nitric acid was not used to dissolve the gold. Chlorine will dissolve just about any metal, even platinum.
Perfect sreetips! I have a good amount of plated pins to process and I want waste the least as possible of gold. So I'm thinking about the best way to do that. Thanks a lot.
The best way to get gold from gold plated pins is to reverse-plate the gold off with a sulfuric acid stripping cell. Please see my video on how to build and operate a sulfuric acid stripping cell.
How do you keep your propane torch from popping and going out?
Keep the flame turned down low.
How do you get the empurities out of jewlry, that are not totally gold?
Terry, please se my video on how to refine scrap gold jewelry
Hi can you give me some information on how to refine silver with items that can be purchased over the counter in the UK thanks
I visited Portsmouth back in 1985. Other than that I don’t know what you have there.
How crazy I love in Portsmouth. Not to worry thanks any way
Live*
What is the best process for Gold recovery from RAM chips? Will the process from this video be used for Gold plated connectors from motherboards and such? Many Thx, keep up making these great and informative videos..
RAM chips is something that I've never done. Gold plated connectors would probably best be processed in a sufuric acid stripping cell, but only if they are gold over metal. Gold on a fiber board material would not conduct electricity so fiber board stuff won't work in a sulfuric acid stripping cell. Gold on fiber board must be processed with acid peroxide. I only did these pins as an experiment to see if it would work. It took much time and acid to get all the base metals out. These would have deplated much quicker in a sulfuric acid stripping cell.
Many Thx @@sreetips
I just started recovery from computer scrape. That is very difficult processing to sort IC chips. Mlcc capacitors and other components and also gold plated pins. Too much time to take to sort all the components. Please tell me easy way if we do another procedure
There is no “easy” way to get pure gold. That’s why it’s so darn expensive.
working on airplane throwing and changing daily yellow pins so am sure time it's aircraft parts must be more gold on it. but the operation is to complicated with all this kind of acid. I have nitric acid can I just let pins on nitric for days and see ?
You'll probably end up with a mess and recover no gold. In the video, I used nitric to dissolve the brass so I could recover the gold foils For refining. I did it for demonstration only. This is not the best way to recover gold from gold plated items. The best way is to use a sulfuric acid stripping cell to reverse-plate the gold off the gold plated items. I made a video that shows how to construct and operate a sulfuric acid stripping cell.
okay I will go slowly.
What paper are you using in stannous chloride
Pieces of filter paper cut into strips with scissors.
Why you use only the brass pins. What will happen with the other?
Brass, an alloy of copper and zinc, is highly soluble in nitric acid. Iron and steel cause problems because it don't dissolve as easily in nitric. Also, when the gold is dissolved in aqua regia, if any metallic iron is present, the gold will tend to cement out on the iron. The iron based gold plated pins are best processed in a sulfuric acid stripping cell.
Hello sir which process is better ap or heating with nitric acid.
I've never used AP on these pins.
Gold from pins you add 1 spoon if SMB video prior to this one you added 8 spoons of smb. What is the criteria for quantity? Both beakers were not that different. Rules?
I just added SMB until I thought there was no more gold in solution. When first starting out add a spoon of SMB then test with stannous. Add another spoon, test with stannous. Repeat until the stannous test is negative. If excess nitric is present (common for beginners) it will take much more SMB until all the excess nitric gets consumed. In time you learn how to add just enough nitric to just dissolve the gold. Then the amount of SMB required will be much less.
How do you recover the gold from magnetic pins? Other than a sulfuric acid cell if applicable? Thanks
If they are megnetic due to nickel then they will go right in with the non-magnetic pins and digest nicely along with everything else (accept the gold which is not soluble in nitric acid). However, if they are megnetic due to iron, then there is a problem because dilute nitric does not dissolve iron very well.
So would I be correct in my assumption that it may be best to just use the sulfuric acid cell for all pins to keep it simple? Trying to separate iron from nickel and non magnetic pins etc is just not feasible it would seem. Thanks for everything and "keep rockin" Makes me want to pull the old Ibanez out of the closet. It's been years.
You can test the pins to see if they are nickel or iron. Nickel will dissolve in hot dilute nitric, but it takes lots of it. We've got some more originals coming. And we got a new pro drummer. I've got to write a hit song and become wealthy making youtube videos so I can pay back my wife for all the years she's had to put up with me. Even then, I'll still be deeply indebted to her. I owe her everything! Get your gitfiddle out and wipe off the dust and jam.
What is the minimum concentration of the concentrated nitric acid?
I used 68% concentrated nitric acid.
Is there any chance for profit with this process, or after costs for acids, do you generally come out with about as much value in gold as you spent to get it? I am interested in doing this myself, but do not want to lose very much money.
No, there was no profit. I bought the pins for the purpose of making the video.
sreetips I understand, however, is there any chance of profit. I am interested in doing this for profit purposes.
The only way I can think of is if you can get the scrap for free.
Sir what’s the filter number you used for filtration, can you learn us how do you fold filter paper
I’ll demonstrate in my next video: Stock Pot Three - in progress right now
I know this is like 4 yrs later but if one would grind up the pins would the reaction take less nitric to produce better or quicker results and by any chance you can be hired as consultant for future simply because i only trust 2 ppl I can tell so far no offense to others you are one of them cody being the other
Chopping the pins up would expose greater surface area and speed the reaction.
what if you just dissolve them in regia?
It would make a very dirty solution that's hard to filter and hard to precipitate the gold from. It's best to remove as much base metals as possible before dissolving the gold in aqua regia.
Is it necessary to kill the excess nitric? Whats the difference of using sodium metabisulfite and
ferrous sulfate for precipitation? is there any advantage of using sodium metabisulfiteto precipitate the gold?
Excess nitric in with the dissolved gold causes problems. It should be "killed" before precipitating the gold. Sodium metabisulfite will tend to bring down platinum group metals if there are any in solution with the gold, especially if excess nitric is present. Ferrous sulfate will not precipitate platinum group metals.
thank you!
Ok. Basic question here. What the hell is a "military-spec gold pin"? What are they used for, and where does one get them?
These type pins are used in plug-in type connectors where high reliability is required such as in military weapons systems. They usually have a thicker coating of gold than say, your cell phone SIM card connectors. If the thin gold on your cell phone rubs through then the only consequence is you won't be able to call. But if your getting shot at and your defensive weapons won't work because saltwater corroded the connectors - BANG - your dead. They can be bought on eBay.
What about the amount of base metals and their value?
Brian, the base metals are tossed. They have so little value and I have so little time. It's just not worth the expense to try and recover them. Especially when I'm recovering precious metals worth hundreds of times more than the base metals
I work on this pins,,after nitric treatment,,,lot of gold foils i get,,,but after ar treatment,,,there is not much gold powder,,,,i also melt some gold foils direcly,,,without ar treatment,,,then i get a small pice of plladinum,,,not gold,,,what is wrong with me,,,plz help
Can i use this process for computer pins? Please let me know
Ubeyde Taşkın ubeyde o manyetik olduğu için yapamazsın riskli
@@burakozdemir2439 manyetikleri ne ile yapabiliriz?
Hello! you didn't try to extract gold from cell phones? It would be interesting to look at this experience.
+Саныч Yes, I'd like to try that. If I can get my hands on a bunch of then then I'll make a video. Thanks for your interest.
+sreetips Perfectly, I will wait for your video =)
not bad... gold is around $40/ gram US right now.. so you pretty much got your money's worth...
500ml of Nitric Acid is around $35. Not to mention the hours of energy spend in labour, heating and other chemicals. Am I missing something?
yeah i rather mine gold with my bare hands
none left buddy, the most potent gold mines literally mine several tons of dirt, and then refine it.
Ok so I messed up I guess. I put a bunch of junk into nitric acid after washing it of course in HCL and rinsing 4 times. It's pins, rc jacks with the plastic rubber still on, a few pinless green cpus, CPU sockets etc.... It's now warming in nitric acid and distilled water. But is very brown sludgy stuff. So it's this coloring b cuz I mixed magnetic and non magnetic? Ugh plz help
Hey streetips , are u available for one on one help? I have experience with gold recovery from E-Waste and gold plated jewelry. But haven't done it a few years. Will be doing a sulphuric cell, AP and nitric acid. I've got a decent amount of material and I want to process it all.
Hello, unfortunately I don’t offer any kind of training or tutoring. And I don’t have much experience with escrap. I’ll try to answer questions if I can.
What was the cost of the acid and other materials?
Back then nitric was about $25 for 2.5 liters - on sale. Today is about $50 for same amount.
dear sir, i wantto learn, but i am not sure about chemical. can you teach for me?
onde voçe compra estes pins meu amigo vc pose mim fala por favor