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Message:: [QUOTE="-jeffB, post: 5326970, member: 27832"]But that depends on how much gunk was there, right? Acetone has very low surface tension, so very little of it stays on the coin anyhow. Having said that, best practice is to rinse in acetone, or do the three-container process [USER=112]@GDJMSP[/USER] and others have described. After the final step, let the acetone evaporate off the coin. I see some people on the forum recommending a water rinse after acetone -- I don't remember if you're one of them. I still think that's a bad idea; if there was something on the coin that's soluble in acetone but not in water, a water rinse could knock it right back out of solution, possibly landing back on the coin. And, of course, water evaporates more slowly than acetone, and if it happens to have anything dissolved in it -- say, salt from your skin -- it can deposit that on the coin.[/QUOTE]