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<p>[QUOTE=&quot;desertgem, post: 1557061, member: 15199&quot;]Acetone dissolves certain organic substances, such as PVC and puts it into solution. If this is not rinsed off completely with acetone and allowed to dry, or used with the successive baths of acetone as Doug described in other posts, you WILL get a whitish, gray are when the acetone dries. Many proofs have thin films of organic material on them due to living with humans, dogs, cats, parrots, etc., so due to the reflective surfaces, you can see the whitish film easily. It may take several fresh rinses before this comes off. Some think that the acetone has altered the metal itself, but chemists do not believe this. Some coins have been darkened with organic substances such as Deller&#039;s darkener to hide the surface of coins, acetone dissolves this substance, so the coin looks lighter and abused ( not Acetone). If any one doesn&#039;t feel comfortable with using it, that&#039;s OK with me, but I do not believe acetone can damage metal itself! But again this is my opinion.[/QUOTE]</p><p><br /></p>

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