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<p>[QUOTE=&quot;Colonialjohn, post: 2134184, member: 57741&quot;][ATTACH]406784[/ATTACH] [ATTACH]406785[/ATTACH] [ATTACH]406787[/ATTACH] </p><p><br /></p><p>As some of you know I collect contemporary counterfeits. SEM/EDS analyzes all the elements in the periodic table. Here we have the typically seen surface contamination of sulfur and chlorine. Normally below Sc we consider these organic type elements and above Sc - metals. Just a cut-off since XRF normally analyzes only above Sc. S &amp; Cl are both &quot; always (i.e., 99%)&quot; seen on the surface of a coin once it makes its way into circulation. This is a silver wash over copper host contemporary circulating counterfeit of the famous 1861 Confederate Half Dollar. </p><p>My point desert gem - these high alloy silver pieces are almost always picking up chlorine and sulfur as you know IN CIRCULATION - hence AgCL. Most discussions and very good ones I might add have been with the W.White Coin Chemistry book following of sulfur and toning and that great A-Z of Sunnybrook postings in 2009 - quite marvelous. OK - fire your questions - its not like I don&#039;t have a 400 page Material Analysis Numismatic book already written due out in 2017 - LOL.</p><p><br /></p><p>John Lorenzo</p><p>Numismatist</p><p>United States[/QUOTE]</p><p><br /></p>

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