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<p>[QUOTE=&quot;ldhair, post: 25692983, member: 11540&quot;]I have used acetone on hundreds of copper coins with no problems. </p><p>I have a group of shot glasses of different sizes. I pick a size that only lets the rim of the coin touch the glass. It takes about 1 to 1.5 oz to cover the coin. I use an old glass flashlight lens to cover the shot glass and let it soak for a few hours, no rubbing of any kind. The glass lens will let you pour off the used acetone. </p><p>Next you let the coin slide out of the glass onto a clean cloth. The rims of the coin are the only thing to come in contact with anything.</p><p>&nbsp;</p><p>Now you clean all the glass with water and a clean cloth. Next I give the coin a second bath with fresh acetone. After a while, I put a drop of this used acetone on a glass slide or mirror and let it dry. This will let you see how much junk is still floating around in the acetone. Coins with heavy PVC may require several baths. </p><p>My last step is to pour more fresh acetone over the surfaces of the coin and let the coin dry on a clean cloth. </p><p><br /></p><p>In my 40 years of doing this, I have never harmed a coin but sometimes the surfaces of the coin that were under the PVC are already damaged and ugly. </p><p>No amount of conservation can fix that.[/QUOTE]</p><p><br /></p>

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