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<p>[QUOTE=&quot;-jeffB, post: 1248945, member: 27832&quot;]It sounds like you&#039;re confusing acetone and &quot;dip&quot;.</p><p><br /></p><p>&quot;Dip&quot; is for removing tarnish (sulfide deposits), and is typically based on a strong but dilute acid along with another chemical (thiourea). It&#039;s sort of like chemotherapy -- it attacks tarnish somewhat faster than it attacks the metal of the coin. If you use it in the right concentration, and for the right (short!) time, it can remove tarnish without visibly damaging the coin&#039;s luster. Use too much, or leave the coin in too long, and you&#039;ll ruin it.</p><p><br /></p><p>Acetone is for removing organic deposits (grease, fresh fingerprints, &quot;gunk&quot;) from the coin&#039;s surface. It won&#039;t attack the metal of the coin, period. But it also won&#039;t do anything to tarnish.</p><p><br /></p><p>I&#039;ve got a pretty good grasp of the chemistry, but I&#039;m not an expert in putting these techniques into practice. I hope someone like BadThad can confirm what I&#039;m saying here.[/QUOTE]</p><p><br /></p>

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