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<p>[QUOTE=&quot;Ed Snible, post: 3222884, member: 82322&quot;]There are a few more details in the link I sent.</p><p><br /></p><p>My limited knowledge comes from a presentation, I believe by Haim Gitler, who used a handheld XRF machine for a study of early electrum.&nbsp; He said the handheld machine gave numbers quite close to the extremely expensive lab machines.</p><p><br /></p><p>The portable machines, which aren&#039;t cheap and have expensive consumables, give a breakdown of the metal and trace elements on the surface of the coin.</p><p><br /></p><p>The idea is that few forgers know the trace elements of ancient coins.&nbsp; If they are using old coins and jewelry there will be unexpected modern alloys or proportions more like modern coinage metals.&nbsp; In the future there will probably be databases of expected XRF values for ancient coins.&nbsp; At that point the machine could flags coins that are outside the profile.[/QUOTE]</p><p><br /></p>

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