Gold Plated Computer Scrap Complete Refining

[@terischannel]

"In the interest of science and discovery." That's my favorite line of any of your videos.

[@robw505]

I've seen many many of your vids and in this video, you can almost hear the exhaustion in your voice just wanting this process to end. Another great science lesson

[@Dr.Gunsmith]

This channel is so interesting. Thanks from across the pond.

[@redbaronrefining5322]

Oh man. I’ve gotten impatient so many times trying to filter hot AR just to have the filter let out in my Buchner as well. Best to let it cool as you know, plus the bit of silver and lead will precipitate once fully cooled and can appear even after filtering. Side note, as I started with electronics refining years ago and had my fair share of everything from pins to transistors etc, try this method out: With material like your pins, add HCL as normal, add about 15% sulphuric acid, and add sodium nitrate. What happens is the sulphuric creates a passive layer over the base metals and puts gold into solution right away. Doing this with a hot solution, one gold is fully disso, quickly decant the solution and rinse the pins well with hcl and agitation. If there is some small cementation of gold on the pins, it’ll get rinsed off with the hcl and trapped in the paper filter. Throw that into your second AR with the precipitated gold and you know the rest!

[@sreetips]

Good tip, thank you

[@robinafoubister]

There are a ton of things I love about your channel, but one my favorite's is the amazing colours that are produced. The brilliant blue of copper nitrate, the yellow and orange of gold in solution, and those filter papers here going from rich bronze to neon green. Just stunning.

[@sin3369]

Professional is defined as the following. Being reliable, setting your own high standards, and showing that you care about every aspect of your job or hobby. Setting a high standard, as well as holding yourself accountable through your thoughts, words and actions. So yes you are a professional sir! Don't doubt yourself of the accomplishments that you done!

[@shaneyork300]

I've seen enough gold pins gold recovery videos and I was hoping you were going to get more than a half gram or people would've said you lost some somewhere. As usual you did not disappoint!!

[@RobFindsTreasure]

Definitely a lot more recovered than expected! Nice job brother!

[@JustJeff62]

Excellent video my friend! WOW!!! 👀 2 grams!!! 👍💪Nice recovery there! Gives me hope for the refine I'm in progress with. I started with 910 grams of vintage gold plated jewelry. Hopefully I get the same results! I'll be happy if I just get a decent R.O.I. Thank you for all you do!!!

[@paulsirmay8405]

THANK YOU FOR YOUR SERVICE, the videos you produce are just an amusing side effect!❣

[@Alondro77]

I'll be doing a batch of this soon myself. I've dealt with a small batch of very thick old pins before. What I did was a partial dissolve with just a little bit of peroxide in weak roughly 1M HCl. Then I let it sit and break down the peroxide in bright sunshine. What it did was poke holes in the plating, but then redeposit the gold (and even most of the copper) as the weaker acid couldn't hold the metal once the peroxide wore off. Tin from the brass core of the pins displaced the dissolved copper too, I suspect. After a day, I tested the solution for gold, and there was none. I repeated it until the gold foils were loose and all washed off. It worked, but it took a ridiculously long time since the pins were 1/8th inch thick at the bases. It would probably have worked best with thin pins. Gold-plated steel pins, yeah, those would likely work pretty well. Iron and nickel chlorides are very soluble at acid pH. Weak HCl actually works much better against steel than concentrated HCl, because ionic chemistry stuff I can't recall explicitly! And a little peroxide would REALLY destroy the steel with those ROS added to the acid.

[@limbahelektronikindonesia4933]

This is great video.You're a great teacher for recovery and refining of precious metals.Thank you,Sreetips.

[@wickedfriggengood6992]

999 Dusan makes poor mans AR for gold plated pins I believe he uses 3 parts hydrochloric 1 part sulfuric and adds sodium nitrate to dissolve the gold with the sulfuric creating a Barrier on the base metals to keep the gold from cementing on them. He said a small amount still cements but uses a brush collects all the sediment then rerefines. Clever guy you should check his channel out.

[@wickedfriggengood6992]

I like to refine computer scrap as a hobby I can’t afford the karat scrap. Love your videos too

[@Silligoose501]

After watching all the time, effort, and materials spent recovering the gold, it doesn't seem that the 14 years it took me to collect that scrap while working at an electronics board house was worth it. Sreetips, I feel so badly that it took so long!! Most of those pins were from military jobs we did so that may explain the yield. Thank you for yet another fascinating videos for all of us to learn from. Best wishes.

[@sreetips]

Excellent, thank you!

[@5roundsrapid263]

Linda, I don’t know if you realize this, your last name means “silver” in German. A bit ironic? Thanks for the scrap in this video.

[@leex187]

It didn’t seem worth all those days for a small bead

[@sreetips]

Lee, we did it for the benefit of you, the viewer. Now you know what it takes.

[@johnnykerner5420]

I completely agree with you on time and effort. Definitely not what It should be especially nowadays

[@joek511]

I mentioned this before. Dilute Ar will blast right through magnetic and stainless base metals. If by any chance it dissolves some of the Au, it will cement right back out. So as usual it's a good idea to test for Au in the solution. When in doubt dump it in a stock pot. Nice button, add a stud and you have one nice looking ear ring

[@lukebowers536]

excellent work, a master class in patience, a nice little surprise at the end too

[@prospectorpete]

Acid/peroxide or dilute nitric is the method to remove the base metals

[@stevezozuk9622]

Wow unexpected results for sure. Great efforts on your part sir for making this video for us. I thank you for that.. It must have been a happy reward when you looked at the scale. Great show today my friend. See you on the next one

[@TheBrood78]

Eyyyy sreetips is back. I've managed to binge watch all your videos in the past few weeks.. My wife's not to happy though! Think I was calling out your name in my sleep lol.

[@mbykhanov]

Hi mr Sreetips. I would like to recommend you to dissolve base magnetic metals a mix of nitric acid and water solution of sulphuric acid (0.4 of sulphuric acid in 1liter water)

[@ianmcewan8851]

I too have been waiting for this one :) BTW these pins and contacts are not just plated gold. Gold doesn't do to well over pure copper or iron so there is usually a barrier layer of nickel or nickel and palladium, which is often quite a bit thicker than the gold layer (I can provide a link if you want). The solution you had at the end was too green, suggesting there might have been some pd in there with the nickel, but that might just be the camera. If there is a next time it might be fun to test for pd too.

[@anthonyrstrawbridge]

I'd bet it's just a smidge of nickel and not enough PD.

[@ianmcewan8851]

@@anthonyrstrawbridge It really depends on the process and purpose of the pins. Pins from connectors that are meant for RF frequencies such as those from the backplane of a network switch, will have very little nickel in them, as the magnetic properties of nickel can cause problems. Those will have a Pd layer of up to several microns with a gold layer that is less than a micro (and some cobalt mixed in). Cheep ENIG (Electroless nickel immersion gold) plating, which you are right is almost certainly what these are, will have a 1-10 micron layer of nickel with a 0.1-0.5 micron layer of gold, with everything else at trace or contaminant levels. ...... it was just that the solution was soooo green, I immediately thought 'ooooo .. palladium!' :)

[@sergeantcraphead]

Guys he knows what he's doing. Nice of you for trying to help

[@andrew2726]

Ian… could you post that link?

[@julianmarsh2758]

I watched all of this again.....Hats off to you!....And you show people how to make money, Sulphuric acid cell for pins, I have a kilo of pins. So, that was a nice yield and you showed everyone that pins can make a nice yield in a cost effective sulphuric cell......So you know your next step like me is, thinking about Sodium Cyanide and Zinc, BTW unless you /us plan to drink it, it ain't that toxic as the MSDS shows......Many thanks again for your time, trouble and persistence, persitance set's you apart from other KZbinrs....stay safe my friend.

[@brandonb1681]

Happy New Year dude. I wish we did cool stuff like this in high school chem.

[@arnedalbakk6315]

Wow... 😊 2 gram..... But lot of work. Thanks. God clip sir👍

[@josephcormier5974]

Every body thinks that you get low results when doing PC scrap but it can be an eye opener thank you for sharing this. Now I have an idea of how much I can get from 11 pounds five stars my friend

[@ArielleViking]

A beautiful little bead and nice it yielded more than expected. 👍

[@MadScientist267]

Heh nearly the same exact scenario I am looking at as far as material. That iron is a PITA. Also noteworthy that it interferes with any HCL/H2O2... Fe+3 catalytically breaks down peroxide, rendering that route all but futile, breaking it down before it can really release the chlorine. I'm looking back more at the sulfuric cell myself for it now... Base metals in chloride solution with gold (except silver) complicates everything. Thanks again for a great video... And glad you got more yield than expected, always a plus. I heard several subliminal "oh come on" in there haha... Glad you pushed on anyway!

[@ezgd2287]

My ears are open, and my mind is ready, sir! Prov 8:10 Receive my instruction, and not silver; and knowledge rather than choice gold.

[@matthewcurry3565]

Yeah just using HCL washes is pretty slow, and takes a lot of acid. I enjoy acetic+H2O2 which is similar to AP but uses vinegar for base metals. I was thinking about just making a AP bath along with dipping material into it to strip the gold away rather than processing the whole lot. Great example, and processing as usual friend, and happy new years!

[@charleswise5570]

I always enjoy watching the experiments. I was gnawing at the bit waiting for you to test some of the solutions you were pouring off. Wondering if there was gold in solution. I enjoyed learning the process of extracting gold from many different sources. Great work Sreetips!

[@anthonyrstrawbridge]

I'm grateful I don't need to replicate this on my own. The amount of time, energy, and materials exceeded my expectations greatly. Sometimes an off the shelf minimalist approach pays.

[@sreetips]

I agree. Getting pure gold, from any source, is never quick, cheap and easy.

[@anthonyrstrawbridge]

@@sreetips I like it when you say, " Karat Gold".

[@MrRebar15]

*sreetips* Bravo well done, thank-you sir for taking the time to bring us along. God Bless.

[@PressureEd]

Love how you keep your errors in the videos. Great stuff

[@davidangell6693]

I can almost feel the frustration and fatigue.....Then a heck of a payoff. That little button is worth $162.00 dollars today. Unreal.

[@tima9531]

$117.7 yield is great!! Love watching the video. Very interesting!!

[@jackmclane1826]

Boiling HCl for dissolving Copper is slowing it down. The compound that does dissolve the copper is the Copper(II)Chloride + Cu => 2 Copper(I)Chloride. This explaines why it takes so long to take off. Because the most active compound must first be created. Feeding forward some solution from a previous batch helps a lot. To convert the Copper(I) to Copper(II) you need HCl and Oxygen from the air. By boiling you basicly drive all the Oxygen out of your solution. So the generation of the necessary compound is stuck.

[@CrimFerret]

That bead looked a lot more pure than I expected it would. Pretty good given what it came from.

[@IMDunn-oy9cd]

Sreetips - I'm seeing a lot of precious metal bullion channels having a discussion about a new type of fractional bullion called Goldbacks. I think it would make for an interesting video if you were to refine some of these Goldbacks and verify the stated gold weight/content.

[@silentferret1049]

I think most try and go for dissolving the gold. The pins just take too long to dissolve. A plating rig might be a solution for the amount on the pins. Then again I think I seen a few try and do a melting to separate the gold and copper off the pins and then separate out the copper.

[@sreetips]

Sulfuric acid stripping cell is best for gold plated material - but I can never get a good yield.

[@DianaDahliaBee]

Mr Sreetips the 15min time lapse without heat was pretty cool!

[@Khodazmoon]

Thank you for this video I was waiting for this Your experiments are very interesting

[@670TXxGregorysxXT670]

I've been waiting for this for a long, long time! Thanks Sree!

[@sreetips]

It took ten days!

[@670TXxGregorysxXT670]

@@sreetips crazy

[@670TXxGregorysxXT670]

@@sreetips I wish you had more of this material to try alternative methods.

[@sreetips]

I don’t ever want to see another batch of that material in my shop - ever!

[@670TXxGregorysxXT670]

@@sreetips hahaha damn so I guess there's no chance you'll do all mine in a video then

[@harveymasciale8888]

Great video!!! It made my mind up to never try this method again. 😄 Striping cell will be my next method for sure.

[@sreetips]

It’s probably best. But I can never get a good yield from the stripping cell

[@spokehedz]

I wonder if more physical destruction--even just whacking the pins with a hammer for a bunch--would help the initial dissolve of the base metals into solution. My reasoning is that the actual gold is extremely thin, but it is covering a LOT of the metal. Making it hard for the acid to get at the base metals. Kind of like how you inquart with silver, but just physically opening up tiny cracks through the gold and into the base metal.

[@Jtretta]

I think an old blender would be quite useful for that.

[@spokehedz]

@@Jtretta yeah, or a cheap coffee grinder.

[@johnnykerner5420]

Excellent video as always

[@craterglass]

Yield better than expected.

[@johannesdesloper8434]

Nice vid sreetips. I've seen many videos on this kind of material and most of the time it has about 4 grams of Gold per kilogram of scrap. I think it also has to do with the production date of the scrap. The older the PC's it came from the more Gold it has. Loads of folks these days just dissolve it all in AR and then refine the percipitate a second time. Guess your rmethod is more safe when there is Tin in the batch and uses less Nitric.

[@quinton3997]

That's good for what you was working with good job and good weight i was afraid you might have lost some in waste

[@chosen1one930]

Add apiece of burned copper to the hcl, it works a lot better

[@ivsongold322]

Very Nice 👍🏾👍🏾👌🏾

[@Bootrosgali]

Is there a reality tv show about this practice coming soon to Discovery ?!?

[@noanyobiseniss7462]

Thanks for doing this as now I know for sure I will NEVER do it! ;)

[@josephpecoul6532]

That e-scrap sure makes a bright button. I wonder what took so long from the time the teaser came out and the video. I was hoping you and ms Sreetips were not down with any of that nasty virus but I see what took all that time. Thanks for the video Sreetips I enjoyed watching.

[@mikefuegmann]

Distilled water can be used to rinse without a negative effect

[@davidlee1719]

Much easier with dilute nitric boil. Quicker and cleaner outcome. Dont want to use full strength nitric.

[@Tim-Kaa]

Excellent video and tutorial as usual

[@xenaguy01]

WOW! I was expecting about 0.3 to 0.4 g, not *TWO GRAMS!*

[@johnhearn9863]

Are these pins ever snipped or ran through a shredder? I feel like it could only speed up the process

[@WaffleStaffel]

I would use an iodine/iodide process for plated items. Iodine doesn't get enough attention. In my experience, reverse-plating is messy and labor intensive (and dangerous) and produces a lot of colloidal gold. Cupric Chloride works best if the pins are chopped up and free of solder.

[@TroubledOnePaydirt]

I’ve watched many, many of your videos at this point. Yet I still, kinda hold my breath when you pour acid into a boiling beaker. I guess I’ve seen too many movies where someone pours something into a beaker and it explodes or something… 🤦‍♂️😂😂

[@sreetips]

Every now and then I’ll experience some serious pucker factor. Usually when I’m alloying silver with the karat gold and pouring it into water. If the alloy gets too hot, it will tend to explode on contact with the water. Scares the day lights out of me. You can actually see my jump when it happens.

[@TroubledOnePaydirt]

@@sreetips any videos u can think of off the top of your head that I could see this in? Curious how that looks.

[@johnahearn8587]

When I did this I used HCL and peroxide to get the base out. It works better than straight HCL.

[@OnsloVest]

Thanks for the effort mate

[@williefleete]

Basically the yield is too low compared to the time spent. Probably would have been better to use the stripping cell on these. High base metal to gold ratio if I understand correctly

[@packycaria6610]

Big fan of your show,,,,because for me it's a show and it's amazing....!!!! One question....why not use suferic acid for disolving rhe base metals? in your OTC video it seemed to be working better...Keep up the brilliant video. un saluto dall Italia

[@sreetips]

Sulfuric acid is messy and dangerous, especially if it’s hot. It forms strange compounds that interfere with waste treatment.

[@darrinwilliams5715]

Thanks for another great video sreetips

[@akfredward3863]

I watch an older video of yours the other day and you used reverce electro plating. I'm thinking that it would work on the pins and take less time. As well as have less cemicol waist. AkFred

[@sreetips]

Reverse plating in a sulfuric acid stripping cell works best with gold plated scrap.

[@jaycharter4345]

Hey Sreetips, did you provide them with the golf ball size pure gold they used for the James Webbbb..? Haha

[@sreetips]

No, but I would have if they asked me.

[@dougdennis3681]

You should run it through the roller and fashion your own little "coin" or flat bar. Stamp it. I'd buy it.

[@HoodBillyLife]

Love your channel!

[@yoashuain1]

How do you extract silver from your waist solutions? Watching Silver grow from Copper is Very Cool.😎

[@sreetips]

Cement it on copper

[@michschep7601]

Peroxide mixed with the hcl will speed up the base metal removal...... pins should be separated from other scrap, being the lowest grade...... chips with gold bond wires are the highest...... gold plated fingers and such are middle grade...... all 3 are processed differently..... the best way for pins and other iron containing scrap is reverse electroplating......

[@sreetips]

That’s exactly what I would say, thank you.

[@tinamitchell8735]

Happy new year .

[@sreetips]

Happy New Year. Can’t believe we’re already on the second month - one more time around the sun!

[@elyworsley3764]

Great video brother! I personally think that smelting those pins would be faster. I don't know if you would get as much gold. Just my opinion I am only a youtube expert. Lol

[@emilalmberg1096]

I wonder if you really have to heat the hydrochloric acid so much. What I mean is that if it is at room temperature and the iron and copper dissolve anyway, for a long time, you do not need to control the process and can just leave it unattended!

[@sreetips]

It may take weeks or months

[@davidgustavomacedo1038]

Parabéns se fosse uma precipitação com, Ácido nitrico dava mais rendimento, mais profundo na purificação do ouro 10 k 14 k 18 k 24 k.👏👏👏👏

[@mitchsguideservice]

Sreetips, If you were to go ahead and combine higher quantities of nitric with the hydrochloric earlier in the reaction, filter as your normally would, then add copper to the filtrated solution to cement out the precious metals, would that speed up this process?

[@sreetips]

Possibly.

[@allrightenergy]

Copper Sulfate is a blue crystal and can be used with electrolysis, and just like you taught us in the Reactivity Series video, Copper will make Gold precipitate out when cooled.@@sreetips

[@allrightenergy]

I would even go so far as to say use Iron Sulfate to drop the gold after Aqua-Regia.

[@kimberlynolz5725]

Awesome man so I ain’t been doing it wrong lol good vid sir

[@wildwisdom56]

This is the negative control procedure compared to your others. Interesting. Probably A/P or nitric from hereon i bet.

[@sreetips]

Correct.

[@wildwisdom56]

@@sreetips I've seen people do a quick wash in aqua regia to rinse off the plating that might be most efficient after some thought. The next step would be interesting to hear from you, maybe your ferrous sulfate trick. Also I have seen a video of guys dunking Pentium processors into a lead silver mixture that they then spread thin and cuppeled it directly into a nice gold piece. You all are pretty amazing! But I think you have determined karat scrap jewelry via nitric boils then to smb precip is most efficient profitable niche. Thanks again!

[@wildwisdom56]

*silver-gold piece they made

[@tinamitchell8735]

After you take the sudium metabisulfite out. stick a copper pipe , you will get all the silver out .

[@sreetips]

Excellent point, thank you.

[@sherifaly1017]

الافضل 👍👍

[@weasel6three597]

Very cool! What do you estimate the cost of materials was needed to get that little bead?

[@katieandkevinsears7724]

I want to know how much time that initial dissolve took. It must have been days.

[@markrady9465]

Out of curiosity wouldn't nitric acid baths sped things up?

[@sreetips]

I don’t know

[@markrady9465]

@@sreetips It would seem to me that from watching all your other videos (which I enjoy) that nitric would dissolve the base metals much faster and more efficiently

[@davidmackay1198]

I wonder how effective it would be to rust out the base metals in a solution of salt and weak acid?

[@ifindmetal]

I wasn’t expecting 2 grams lol

[@snakeplissken5136]

What percent nitric acid should I be using for my silver refining? Used 80% the last couple times but it seems expensive. Any help would be appreciated 🙏 thanks, you are the reason I even started messing with this stuff, lol

[@sreetips]

Don’t do it without a fume hood

[@Uraeus_]

Is your waste-treatment bucket also a stock pot? Or do you not deem some liquid waste or used filters worthy of keeping due to large amounts of copper or iron which may cause issues recovering gold and other precious metals?

[@sreetips]

The waste bucket full of iron is all junk in there. All precious metals gone. Mostly copper in there mixed with iron

[@spotlobac7694]

oh whats that little bit of nitric do ?

[@bigredracer7848]

49👍's up thanks for sharing

[@bigredracer7848]

I enjoy watching your show it's amazing what you can do with a few liquids and some heat thank you for all the wonderful education you give away for free

[@dbaca148]

Another great vid sreetips. Comparing the straight HLC and the HLC/H2O2 recovery methods, which do you like best for computer scrap?

[@sreetips]

I learned the acid/peroxide method and that’s the one I’m familiar with. So I’d say that’s the one I prefer.

[@dbaca148]

@@sreetips thank you. this guy uses nitric by itself to remove the foils and it looks to be much easier and faster kzbin.info/www/bejne/jIm7h6aCi99onKc think you can do a video on recovering and refining the foils using this method please?

[@moose83able]

what kind of filters are you using? I like the ones you use but all I'm seeing when I go to buy them are the flat ones. I want the ones with the walls like you use

[@sreetips]

I made those myself from large round flat filters

[@Ziegen-Sauger]

Mr Sreetips, now that my hobby became serious, I am looking for ways to reduce cost (a.k.a. use less nitric). More than 90% of what I refine is exactly what you have one video. Most often, I use HCl only, it does not take that long and I never had to keep renewing the acid. Worse case scenario, for example, when my batch is taken more than 4hrs, I add H2O2. Last week, I tried sulfuric after watching one of your latest videos, worked fine as well but generated a lot more waste. I wonder, in the first small beaker test, why it took that long and you had to change the acid that many times. And Indont discriminate, magnetic, non magnetic, whatever eWaste pin is game. Also, since the yield is low, I usually wait to accumulate a good amount of foils and flakes, either to treat with AR themselves, or combining with under 1 gram of placer gold I receive as gift every month. Anyway, I am curious about the volume of HCl and the time it took.

[@wahidali7586]

I was waiting to see this video. Very nice work. But I m confused. U put nitric in HCl to remove base matels and boil that gold did not desolve at that moment. I think that work like aqua regia

[@sreetips]

It’s confusing. The dilute aqua regia will tend to dissolve the base metals first. Any gold that goes into solution will cement right back out on the base metals - it won’t stay in solution so long as the base metals are present.

[@roczilla2405]

Can you refine goldbacks wondering how much gold can you get out of them just a thought

[@sreetips]

I think they have 1/100 of a gram

[@roczilla2405]

Yes that what they say but what can you actually get out of them ?

[@sreetips]

At that level it would be hard to accurately tell

[@MarcoSalvador-v4d]

I'm lying here with my good friend Linda on my mind

[@joewarrick6043]

Hi sreetips. I was wondering if a sand core filter is ok to use during the filtration part of the process? And eventually wouldn’t it clog up

[@sreetips]

I e never used a sand filter. Don’t have any experience with one of those.

[@nikolajwinther5955]

"Hydrochloric acid in a squeeze bottle. Turned out to be a pretty good idea." - Famous last words Just kidding. I've been thinking sometimes that it'd be easier with acid in a squeeze bottle, but I figured there are severe safety concerns that takes precedence. You maybe want to colorcode or something so you don't get them mixed up.

[@iralas]

Would be better to grind them to dust and use mercury to create amalgam and extract from that

[@sreetips]

I’d rather let the chemicals do all that work.

[@mattihansen9700]

Hey sreetips, what is the dish u place the beaker in made from. i have tested some different ones all of them have cracked on the hotplate..

[@sreetips]

Pyroceram - Corning ware

[@hendlers7071]

Hi Sir - Can you tell me what kind of mask do you use ?? Thanks for your great vid's !

[@sreetips]

3M P95

[@jaycharter4345]

I didn't know what you were doing I thought you were doing some weird hydrochloric test to see if you could just use that to get the gold off and then you started adding nitric crazy 🤣

[@sreetips]

Adding small doses of nitric forms a week aqua regia that will tend to dissolve the base metals first and not the gold. But any gold that does dissolve will cement right back out on the base metals.

[@jaycharter4345]

@@sreetips I get it I think that's amazing that it keeps cementing back until the base metals are gone. But what was the point? Why didn't you just use straight nitric acid? Super curious have a good one buddy

[@jaycharter4345]

Maybe just to show a different process? maybe I just didn't get that at first

[@sreetips]

Aqua regia does it better

[@jaycharter4345]

@@sreetips I think I was just assuming that nitric acid would have been more efficient and faster. I don't think you have a video where you've used Nitric on computer scrap. Like you do on gold filled jewelry, Etc. Wait a second I know what I am considering wrong you don't use hot dilute Nitric until after you Inquart it. I forgot about that whole process. Alright looking forward to the next one man