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[gyverlb]

I'm not really sold about gold or silver purchasing but I'm curious : how do you people make sure that the metal is pure?

I've never purchased gold or silver, but a carefully prepared alloy to mimic the density and gold or silver plating would most probably look the same than pure gold or silver to me (I don't think I've even seen a real ingot). There have been stories about fake ingots circulating so it's already happening. How do you select your sellers and how do you check the material (even if y our sellers are honest they might have been fooled themselves)?

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[BTCGOLD]

I'm not really sold about gold or silver purchasing but I'm curious : how do you people make sure that the metal is pure?

I've never purchased gold or silver, but a carefully prepared alloy to mimic the density and gold or silver plating would most probably look the same than pure gold or silver to me (I don't think I've even seen a real ingot). There have been stories about fake ingots circulating so it's already happening. How do you select your sellers and how do you check the material (even if y our sellers are honest they might have been fooled themselves)?

I order the gold directly from the producer/manufacturer (Heraeus, Umicore, Degussa, ESG). So they cant be fake.

If you create a 100 gramm copper bar and plate it with gold, its still able to identify it. Because copper got  a different density.

[gyverlb]

If you create a 100 gramm copper bar and plate it with gold, its still able to identify it. Because copper got  a different density.

Of course, this is why I wrote "alloy".
Gold is 19320 kg/m3
Tungsten is 19600 kg/m3

So mixing Tungsten ($100+/kg) and a little of a lighter metal can produce an alloy with the exact same density as gold. Once plated with gold I don't know how to tell the difference. My question was : does anyone here know?

[SolarSilver]

If you create a 100 gramm copper bar and plate it with gold, its still able to identify it. Because copper got  a different density.

Of course, this is why I wrote "alloy".
Gold is 19320 kg/m3
Tungsten is 19600 kg/m3

So mixing Tungsten ($100+/kg) and a little of a lighter metal can produce an alloy with the exact same density as gold. Once plated with gold I don't know how to tell the difference. My question was : does anyone here know?

There are various tests, some are intuitive (take a bar of silver, put it in a plastic bag, hit it. It has a very specific ring)
to technical. For gold and silver, take it to a real world PM shop and have it tested using acid (aqua fortis).

As for gold plated tungsten, that is hard but not impossible to detect, using either a drill or if you want non-destructive test, put a variable wave sine through it, tungsten and gold don't react the same. Same with ultrasonics.

There are many stories (urban legends) about this stuff, it only makes economical sense to fake larger size ingots. The only exception I've ever seen is the Chinese Panda coins but then again, most stuff coming from China is tainted ;-)

PS: You can fake siver with molybdenum as well

http://www.zerohedge.com/news/tungsten-filled-1-kilo-gold-bar-found-uk
https://www.youtube.com/watch?v=5FvM_4B7Pkc