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<p>[QUOTE=&quot;NorthKorea, post: 2550190, member: 29643&quot;]What I vaguely understand of chemistry leads me to believe that one should almost never leave copper in an acetone bath for eight hours... From what I recall (and Thad will most certainly have a better explanation), copper + acetone + water vapor (moisture in the air?) will result in copper-acetate and acetic acid over time. This is one of the reasons that I generally use acetone as my final stage bath for acetone soaked coins, as opposed to distilled water. The acetone will dissolve whatever remnant organic material (and &quot;wash away&quot; the contaminated acetone) then evaporate in the air. Yes, this results in white coins sometimes, but, as others have said in the past, that white stuff is damaged coin.[/QUOTE]</p><p><br /></p>

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