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<p>[QUOTE=&quot;Maxfli, post: 3246586, member: 69089&quot;]For me, acetone and xylene have performed very similarly. Both are effective at removing the organic gunk that can accumulate on circulated coins, as well as adhesives. (I always treat uncirculated coins too, because I have no way of knowing how they&#039;ve been stored nor what unseen contaminants might lurk on their surfaces).</p><p><br /></p><p>At the risk of provoking another debate among the CT chemists (please don&#039;t, that&#039;s not what this is about), I would add that I&#039;ve had a handful of unpleasant outcomes with acetone on brass plated* coins, aluminum* coins and, in one instance, a bronze coin (a 1940s British India 1/4 anna to be precise). </p><p><br /></p><p>Could there have been other chemicals present on those coins that contributed to the aforementioned problems? Possibly, but it&#039;s been way too long since college chemistry for me to hypothesize, nor do I really care.&nbsp; Suffice to say, to play it safe, I use acetone on silver and cupro-nickel coins, and xylene on anything else. Since I started following this protocol I&#039;ve had no issues and both solvents seem to get the job done.</p><p><br /></p><p>*Pretty much a non-issue if you&#039;re not into world coins.[/QUOTE]</p><p><br /></p>

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