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<p>[QUOTE=&quot;Colonialjohn, post: 2337648, member: 57741&quot;]In general quantitative terms here - At this point and with my investigations and as described in my new book coming out in and around November, 2016 on contemporary circulating counterfeits and their Material Analysis we know now on any coin surface the two most common contaminants are sulfur and chlorine. We do know for this 90% Ag alloy 1964 Fed U.S. coin that 5% of its make-up or so is copper. IMO by process of elimination of the silver and copper chloride and sulfur type compounds which can form on the surface (i.e., natural or man-induced toning) we are probably? (accurate photo?) dealing with a copper (I) oxide or cuprous oxide (reddish toning) surface here and probably with other surface contaminants (i.e., again a mix of sulfur and chloride - Ag &amp; Cu compounds in minor percentages). Appears to be a 1964 coin which has leached copper severely possibly due to exposure to high heat. Again - it could be a coating? Unlikely. Again - IMO. </p><p><br /></p><p>John Lorenzo</p><p>Numismatist</p><p>United States[/QUOTE]</p><p><br /></p>

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