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<p>[QUOTE=&quot;medoraman, post: 2155798, member: 26302&quot;]Most I have ever seen on 19th century coins, (all three metals), have been organic based if that helps. Seems to be some kind of black tar/oil from fingers mixing with dirt or something. Anyway, all coins like this I have bought over the years have dissolved with petroleum distillates like acetone. For some reason I had a batch of Peace dollars with this gunk once. I think I made three trips to the hardware store, since they only sold it by the quart.[/QUOTE]</p><p><br /></p>

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