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<p>[QUOTE=&quot;desertgem, post: 3047760, member: 15199&quot;]Yes, that was what I was referring to in post #21. It seems to use ultrasound transmission time to determine the metal(s), but it has to be specific for silver and the Gold-platinum group to be accurate. It is said to be effective for bullion, but I have not seen a &quot;blind test&quot; in any reviews. Maybe someone in the bullion group has one and can comment. So I do not see how it could be determined to be zinc. Copper detection is more realistic, and the instruction manual on that post mentions copper in jewelry as problematic. Most experts you would send to would do weight, size ( compared to a known cent) and specific density to compare with zinc&nbsp; and/or copper.&nbsp; Most large universities with a geology or mining studies could probably d it, maybe even 1 or 2 members that have such equipment. Alas, mine does not.&nbsp; Jim[/QUOTE]</p><p><br /></p>

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