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<p>[QUOTE=&quot;Maxfli, post: 7279950, member: 69089&quot;]There&#039;s nothing natural about some organic crud (if that&#039;s what it is) stuck to the surface of the coin. Trying to lift it off with acetone is a harmless exercise because acetone doesn&#039;t interact with the coin itself, only with things that may be on the coin.</p><p><br /></p><p>Edit: sorry, OP, I skipped over the part where your tried acetone and it didn&#039;t work. Seems like your only other option may be professional conservation.[/QUOTE]</p><p><br /></p>

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