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Message:: [QUOTE="900fine, post: 934226, member: 6036"]Hoochie mama ! What a babe ! So you're the one who outbid me on this coin ! (just kidding...:hug: I wound up with his S-243, and couldn't be happier...)   Probably not. Ideally, acetone is only a solvent. This means it will remove stuff adhering to the surface of the coin and will do nothing for anything which has reacted with the copper. Recoloring is not paint, it is a reactant. It chemically reacts with the surface of the copper. Thus, the surface layers of copper atoms are no longer elemental copper, but rather oxidized copper salts - sulfates, sulfides, oxides, and who knows what else. The only way to remove that color is to remove original mint copper. That's one reason why anti-cleaning people have so much motivation to "leave it as it is". Organic solvents won't remove those oxidized copper salts, as thes alts are ionic and organic solvents aren't. They only way to remove them is to react them to form soluble salts. My best guess is that's what VerdiGone does - it reacts them to form soluble nitrates. It might go so far as to oxide cuprous (I) to cupric (II).[/QUOTE]