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<p>[QUOTE=&quot;-jeffB, post: 2755284, member: 27832&quot;]I disagree strongly.</p><p><br /></p><p>1) Acetone has very low surface tension, so very little will stick to the coin long enough to redeposit anything.</p><p><br /></p><p>2) When water mixes with acetone, it can force the stuff dissolved in the acetone back <i>out</i> of solution -- and it will then stick to whatever&#039;s handy, including your coin. (But because of point (1), you can often get away with it.)</p><p><br /></p><p>I think the best approach, and one I&#039;ve seen recommended here, is to use three acetone containers. Dip and/or soak in the first, then dip in the second to rinse, then dip in the third to rinse.</p><p><br /></p><p>The first one will dissolve everything off the coin. Some of that stuff will remain dissolved in the few drops of acetone that cling to the coin as you pull it out. The second will dilute that dissolved stuff by somewhere between a hundred and a thousand times. The third will dilute the tiny remaining amount by <i>another</i> hundred to thousand times, so that when you pull the coin out the last time, you&#039;ll have no detectable contaminants left on the coin.[/QUOTE]</p><p><br /></p>

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