nilered has done a few with the extractor and the wiki has an awesome gif for the mechanism I can't stress this enought: I WANT MOOoooOoRE love dalitas
Dude, I was looking on the internet and I can't find a really good video on extracting (if that is a correct term) precious metals from car catalytic converters. Some sources that I found, but I could not verify them said that some of these converters can have 1 to 2 grams of platinum. Cody's Lab here on youtube made a video that found a relatively large amount of platinum in highway dust. Used catalytic converters are relatively cheap at junkyards and I never seen, at least in my part of the world, people looking at them with interest... I even heard that you can buy at my local junkyards catalytic converters at the price of junk metal like aluminium or steel. It would be very awesome to see how much precious metals, and which kind you can extract from these things that sometimes are just sitting around the junkyards.
+Archer Sterling you would cut out the parts with the precious metal and then use combinations of acids to selectively get them into solution then use a reducing agent to get back the bade metal (and then melt it) it's the same principle as Cody uses but you will just have to adapt it to the converters
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I think both of your camera set ups are pretty good. NurdRage tends to have higher contrast (less glass against white backgrounds), and NileRed has fantastic and unique ways of using glassware to illustrate. (mad scientist lab set ups. :))
Excellent work! This is very useful information for quick spot testing of materials and will be very helpful to me in the future. Many thanks Nurdrage, you are the best!
For coins you generally don't need to go that far. There are many ways to know it's a counterfeit before hand. Plus you would damage the coin with a scratch test which might be just silver plated anyway.
Well, it's not like he blew all that money. He bought platinum, and retains that same value in precious metal, that he can turn back into cash as he pleases. It's like buying stock, versus buying champagne and drinking it.
He played with it then got his money back the seller got a scratched acid smeared coin and probably was out shipping costs and insurance. Kinda sketchy.
What would this do to nickle or chrome plating?Would it react to gold plating and, thereby, react to gold plated silver?What about silver alloys such as assorted Sterlings, Vitallium and silver solder (silver, tin, lead being one of the more common ones)?
true. Magnetic and density tests are non-destructive but a good forger can fool that too using the right type of alloys. The best foolproof non-destructive test i know of is X-ray fluorescence spectroscopy. Unfortunately the instrument for that is a bit beyond the budget of an amateur.
For numismatics it rarely gets to that point for coin dealers. To spot a counterfeit you look for: the strike of the coin, the wear of the coin, the weight, dimensions. You don't want to damage the coin with a scratch even on the rim and even if you do it can just be silver plated. For expensive coins they have them slabbed by companies called NGC, PCGS, ANACS, ICG. They guarantee authenticity and they give a grade.
Many forgers will use the exact amount of silver because they're concerned with numismatic value. Also you should have tested on some silver coins not just bullion pieces. There's 90% silver in a morgan dollar and in US coins that are 1964 and earlier. There's 40% silver in US half dollars from 1965-1970. There's also Canadian coins with 80% or 50% silver. More items to see different reactions.
+hardworker424 The objective of this video was silver testing more for bullion rather than collectors. For a scientist who makes chemicals out of silver, we often buy silver bars and occasionally we would like to know if they're authentic. We don't really care about appearance.
NurdRage If you're using it for experiments and you don't care about the look a surface test is not enough imho. Drill through it, then test it. Generic silver rounds and bars can contain less silver because there's no real accountability. I'm no where near as knowledgeable in chemistry as you are but I do know if the item is 80% silver and you need it to be 99.9% silver there will be problems.
About $1.2k-1.5k(depending on time of purchase) Fortunately the value is stable enough and minting is cheap enough that even if the coin was damaged, he would be able to get most his money back even if scraped.
Can you make a video on the Marquis reagent? I know what components are required to make it, but I'd like to see this style of video about it. I've already seen the one made by backyard scientist.
Hey NurdRage are you going to make hydrogen peroxide in the future?. I know it is pretty simple to make sodium peroxide but going from sodium peroxide to hydrogen peroxide is another challenge. I think it involves sulfuric acid precipitation.
+NurdRage are you one person as I suspected? or are you a group of people as other commenters were saying (think it came up on another channel), as evidenced by different hands in experiment
It would be also nice to see the process of making Hydrogen Peroxide via electrolysis of Sulfuric Acid and then vacuum destilation to collect the H2O2.
Hello. Is there a chemically tested way to determine if we exist in a universe that is theorized as comprised of mostly dark energy ( not dark matter we know what matter is ) with 70% or so of this almost undetectable property everywhere around us,I was thinking (ouch) is banging particles at near light speed the way to go or perhaps chemically examined could provide an easier,cheaper result. Patron.PEACE...
Very useful video. We that follow precious metals know that the real price of silver, if gold is $1300, is around $80 an ounce. I behooves a person to have silver as a hedge for the hyperinflation that will hit when the US dollar is removed as the world reserve currency,
So if a 'silver' coin is fake, what metal(s) would most likely be present in the fake instead? Is it usually zinc or iron, or is it some other metal? If the coin was chromium-plated, there'd be no reaction with the solution, right?
Yes. His test is only valid for a pure coin, whatever the metal may be. To properly test gold or silver with test solutions, you have to put a nick or scratch into to specimen, to get through any plating that may be on the outside. Obviously, you do not want to do this on a specimen that has much value outside its bullion value. As far as I know, all the fakes so far can be detected by careful measurement of diameter and thickness, as well as weight. A specific gravity test would add another data point. These are all non-damaging.
As said in the video a scratch test and then using the solution on the scratch marks is better since it causes much less damage. If you're buying silver for bullion then it doesn't matter what it looks like as long as it's real. If you're buying silver for looks then as long as it looks good does it matter if it's fake? If you're buying for both then you need to find a very reputable seller like a mint or a bank whose reputation is above reproach.
alrighty then, just keep in mind for others in the future. To answer your question: nitric acid also dissolves other metals so it wouldn't be able to tell you that something is silver
Just wanted to pop in to say how helpful these videos are for reference purposes when I inevitably forget to write the formula down and don't feel like trudging through forum bookmarks to find it. I've been going through all your old videos when I need a process reexplained to me. I can watch these three times and learn something new each time. ...that probably says more about me, but oh well
You would have to dissolve too much of the specimen and, if it is not a pure metal, there is no guarantee that you would get a proportional dissolution. For example, with sterling, the copper is not going to dissolve at the same rate as the silver. And you don't want to use aqua regia on silver, as you get messy silver chloride., which passivates the reaction.
They are highly oxidizing so they can oxidize all kinds of biomolecules in your body such as DNA. Damaged DNA can in turn lead to development of cancercells.
Could be, I'm not a specialist on this topic after all but I'm pretty sure it has something to do with its oxidizing properties. In general, oxidizing compounds are harmfull to some extent. Hydrogen peroxide might not be carcinogenic but it is toxic for cells, hence its use as a desinfectant.
Na2S and HCl wouldn't work since it will give very similar results with other metals too.NaCN and Na2S will be a 100% accurate silver test since it blackens the surface of silver on contact but it would also be extremely toxic though...
+casaverdero not only that. Na2S reacts with HCl pretty powerfully to form NaCl and gaseous H2S. I had to mix these two this year. You know, S2- ion recognition. I just dropped about 1 g or 0,5 g of Na2S to about 15 ml of 0.2 mol/l concentration of HCl. I didn't really expect such a violent reaction, but then i needed to smell H2S. First i tried to do it carefully, but when i realised, that i don't feel anything different, i put my nose closer to the tube. Then the smell got me. Wasn't able to smell anything for half an hour. Oh and you can't use NaCN too. It reacts with any acid to form HCN (lethal gas) and a Sodium salt.
McVidsAndTutorials I'm so suck of wannabe-experts, "I did this once so I know everything". Generating H2S gas is the point, it reacts with silver to tarnish it black (Ag2S). The question is if it happens rapidly enough to be visible. Both HCN and H2S are very toxic, with a similar mechanism of toxicity. But you will never reach dangerous levels of either gas in a small metal test, for two reasons. HCN is miscible in water and a H2S has a good solubility too, only minute amounts should bubble out.
+McVidsAndTutorials I never said mix HCl and NaCN i said Na2S and NaCN.NaCN dissolves gold and forms Na3[Ag(CN)4] then Na2S breaks this complex and forms black Ag2S.This can only happen to silver or gold and since gold has a characterisic color its 100% guaranteed to identify silver.
Why not just use a touchstone? Just rub what you know is the silver you want on the surface and then rub the mystery metal next to it. If the traces don't match, you know that the mystery metal is not what you want. It maybe silver, but it might be too pure or not pure enough or mixed with something you don't want like copper.
a lot of people do so (and also did so in the past. In preindustrial times you could see people wearing lots of silver and carry a small touchstone around with them for trading purposes), but there are different purities of silver and different alloys that can lookalike on a touchstone, especially if you are not used to using the touchstone (you need to get used to *your* touchstone, others look differently). So its some kind of art, whereas the chemical one is science. Though both methods do not tell you anything about the purity of the silver. Would have loved to see this with common silver alloys
LOL, personally, i'd want platinum to be dirt cheap because it so useful for chemistry. Pisses me off that everyone else is using it for worthless things like money and coins... pfft!
On the contrary, using resources for physical money stores them, whereas using them for something like chemistry or industry effectively consumes them much of the time, depleting that limited resource.
What is better: Having a pound of platinum sitting in a vault Or the understanding of chemical processes that let us further expand our understanding of the world.
