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<p>[QUOTE="-jeffB, post: 7404515, member: 27832"]I think I'd try distilled water before trying acetone, but acetone first won't hurt. You're right that it's harmless. (Don't leave them in bright light while they're soaking, though; there's a remote possibility of light-catalyzed reactions that can change the color of copper.)</p><p><br /></p><p>If the spot's been there for a long time, though, it's likely that some toning has happened, either under the spot or everywhere-<i>but-</i>under the spot. That's harder to fix, and requires a chemical approach.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 7404515, member: 27832"]I think I'd try distilled water before trying acetone, but acetone first won't hurt. You're right that it's harmless. (Don't leave them in bright light while they're soaking, though; there's a remote possibility of light-catalyzed reactions that can change the color of copper.) If the spot's been there for a long time, though, it's likely that some toning has happened, either under the spot or everywhere-[I]but-[/I]under the spot. That's harder to fix, and requires a chemical approach.[/QUOTE]
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