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<p>[QUOTE=&quot;Maxfli, post: 3055189, member: 69089&quot;]I&#039;ve experienced discoloration of copper/bronze coins on two occasions using acetone. One was a British India 1/4 anna, and I don&#039;t recall the other.</p><p><br /></p><p>Since then, if I buy a copper/bronze showing some gunk in the devices, it soaks in water first, then xylene, and for the most part that has been effective.</p><p><br /></p><p>On a handful of occasions when that wasn&#039;t totally successful, I&#039;ve put the coin in acetone for just <u>a couple of minutes</u> without any adverse effects, then rinse and back to xylene. I can&#039;t explain the chemistry of it, but that seems to help.</p><p><br /></p><p>One caveat: I don&#039;t have a large enough experience sampling to draw any conclusions, but the two times I had a problem, it was with bronze coins. l&#039;ve soaked old English coppers in acetone for longer durations without mishap. Conclude from that what you will, if anything.[/QUOTE]</p><p><br /></p>

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