[Jewelry making - Article 00136] - Re: [Orchid] [Source] Custom titanium bands

[James Binnion]

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Hi Dr Mac,

>     Interesting factoid: because platinum and tungsten (not the
>     carbide) have almost identical specific gravity values, tungsten
>     has been used to counterfeit platinum coins. 

    It is even a closer match to gold (Specific Gravity W 19.254, Au
    19.302, Pt 21.45) and there have been some gold coins floating
    around that have been radially drilled and then tungsten rods
    inserted into the holes then the edges plugged and re-milled. This
    leaves a coin that short of an x-ray image or melting it down passes
    for a solid gold coin. 

Regards,

Jim

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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