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<p>[QUOTE=&quot;SuperDave, post: 2345678, member: 1892&quot;]One may assume that the TPG&#039;s have been employing XRF (X-ray Fluorescence) technology for a long time, giving them the ability to identify alloy compositions with extreme accuracy, within the limits of the technology. They can detect 2ppm of lead in sand, but can be limited in depth when differentiating numismatic metals due to their relatively-similar atomic makeup. Check it out, it&#039;s pretty cool handheld tech. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>The kind of magnification and imaging quality available to the amateur numismatist these days is enough to do professional-level optical surface analysis at one&#039;s desk for a few hundred bucks. I screwed up a few years back and bought an overdipped Morgan, and watched the surfaces deteriorate in my (cheap) USB microscope as I successively dipped it by stages into oblivion. The camera sucked, and simply couldn&#039;t capture what I was seeing on the screen. So yeah, in my opinion that&#039;s possible.[/QUOTE]</p><p><br /></p>

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