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<p>[QUOTE=&quot;-jeffB, post: 24694475, member: 27832&quot;]Acetone will affect <i>only</i> certain kinds of surface deposits (mostly organic matter, greasy/tarry/plasticky stuff).</p><p><br /></p><p>Most of the white, green, and dark spots you&#039;ll see on Zincolns are metal oxides and other mineral stuff. As you&#039;ve shown, acetone won&#039;t touch those. You could let the coins soak in the stuff for a century, and the deposits would still be there.</p><p><br /></p><p>Mild acids like vinegar will get rid of the deposits, but they&#039;ll ruin (further) the underlying coin as well. Don&#039;t ever do that to a coin that might be valuable, but feel free to try it on the coins you pictured; it will be educational.[/QUOTE]</p><p><br /></p>

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