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<p>[QUOTE=&quot;jeankay, post: 413683, member: 12159&quot;]The entire coin was super heavily encrusted with black corrosion, and I could barely see what denomination and year it was. When I retrieved the coin the solution had turned dark green so I had to fish for the coin with tweezers to remove it from the solution. As far as I could tell there wasn&#039;t a bit of copper left. The only other possibility is the corrosive deposit could have already eaten the copper away. Yet, I had a nice shell of black gunk which was still quite stiff left over. </p><p>&nbsp;</p><p>I can guarantee that I won&#039;t be doing that experiment again... and will definitely be extremely careful *if* I ever try to clean a coin with that product. Usually I put these coins in the &#039;get-rid-of-it&#039; bag and don&#039;t even consider cleaning them.</p><p>&nbsp;</p><p>jeankay[/QUOTE]</p><p><br /></p>

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