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<p>[QUOTE=&quot;Colonialjohn, post: 3019729, member: 57741&quot;]Look at Wu&#039;s 12/11/2016 photos 233507.jpg and look at the Cu/Zn interface magnification area suggesting to me this was applied and not removed from experience. It&#039;s a tough call for a non-scientific background NGC authentication process. In my new book Forgotten Coins I talk about a new contemporary circulating counterfeit silver electrodeposition process beyond the Sheffield Plate process for the Mexican Cap and Rays in the 19thC where pure silver (99%) is applied over the host (i.e., any metal even copper). Why would anyone apply zinc over a copper host and leave it UNFINISHED? I would expect no polishing lines in the central core under a stereo microscope or possibly that also would have come out in the NGC validation? BTW with electrodeposition XRF surface analysis does not help due to the process of electrodeposition. However in a removal (i.e., etching) process sometimes a high organic like chlorides as described in my book can suggest an acid (HCL) removal process. For this circular area not with this accuracy though (i.e., circular area and texture at the interface going thin to thick) - IMO.</p><p><br /></p><p>John Lorenzo</p><p>Numismatist</p><p>United States[/QUOTE]</p><p><br /></p>

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