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<p>[QUOTE=&quot;-jeffB, post: 24892665, member: 27832&quot;]Chemical kits work by dissolving part of the metal. You either drip the solution onto the object, or drag the object across a stone and test the streak that it leaves. Neither one is something you want to do to a coin, unless it&#039;s already completely trashed.</p><p><br /></p><p>XRF is probably the <i>best</i> detector, but I&#039;m assuming price is at least somewhat important, and those are still well into five figures.</p><p><br /></p><p>I can&#039;t comment much on the Sigma devices, except to say that I&#039;m less skeptical than I used to be. (I used to think they were practically useless; now I think they&#039;re generally useful, but not necessarily reliable enough to risk large purchases based on their verdict.)[/QUOTE]</p><p><br /></p>

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