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<p>[QUOTE=&quot;jackeen, post: 141201, member: 5683&quot;]If I recall, every gold or silver mine has its own unique characteristics, and the metal from them can be identified using one of those spectrometer things.</p><p><br /></p><p>On a more macabre note, Swiss 20 franc gold coins from 1947 have six times the trace mercury content of previous issues, supposedly because so much of the gold used to mint them was ripped from the jaws of murdered Jews, where they had absorbed small quantites of the metal from amalgam fillings in other teeth.[/QUOTE]</p><p><br /></p>

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