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<p>[QUOTE=&quot;Theodosius, post: 2777599, member: 77077&quot;]I agree with this advice.&nbsp; If this is a real black patina caused by copper corrosion, like copper oxide, then organic solvents will not remove it.&nbsp; You could also try acetone first to see if this is paint.&nbsp;&nbsp; In the old days people used to paint coins to &quot;improve&quot; them.&nbsp; It could be really old varnish or it could be plain old dirt. Kentucky&#039;s advised approach should remove any of those without hurting real patina or the coin.&nbsp; If they don&#039;t get it off then I would leave it.[/QUOTE]</p><p><br /></p>

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