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<p>[QUOTE=&quot;Colonialjohn, post: 3936915, member: 57741&quot;]For those who read Gurney&#039;s book on Counterfeit 8&#039;s after Sheffield Plating electroplating in a cyanide bath was used to silver electroplate many of the Cap and Rays (i.e., circa 1840 or later). These are unusual - the silver electrodeposited counterfeits normally have pure silver deposited on them so the surface Ag readings are generally ~99% by XRF ... rememering this analysis reads only the top 20-40 microns of the surface making them very dangerous at times in UNC grades. Interesting experiment using this process to remove surface contaminants. Perhaps an effective method moving forward in removing carbon spots from UNC coins? Do you have the nerve?</p><p>John Lorenzo Numismatist United States[/QUOTE]</p><p><br /></p>

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