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<p>[QUOTE=&quot;Colonialjohn, post: 3002556, member: 57741&quot;]NSP right ballpark but really copper with the elements chlorine and sulfur. See that simple book Coin Chemistry by Weimer. Not to self-promote but as some of you know when I do sell contemporary circulating counterfeits (CCCs) on EBAY I do provide SEM/EDS scans and the two most common organics or what are the lighter elements of the Periodic Table that really tone a coin are sulfur and chlorine. <span style="color: #ff4d4d">edited</span> I go into much more detail in my new book Forgotten Coins. I also discuss the metallurgy of Chinese Modern Forgeries. CCCs are the pieces like 18thC English and Irish Halfpence that circulated in the American colonies and made up ~50% of our hard money in the COlonies in the 18thC. Don&#039;t let the words counterfeit and EBAY suprise you ... &lt;VVBG&gt;.[/QUOTE]</p><p><br /></p>

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