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<p>[QUOTE=&quot;Maxfli, post: 26072572, member: 69089&quot;]We’ve flogged this horse many times before, and typically a chemist will come along to explain in scientific terms why I must be wrong. I’m not a chemist and remember very little from my college chemistry classes, but I do know what I’ve personally witnessed, and it’s this:</p><p><br /></p><p>I’ve used both acetone and xylene to “de-gunk” silver, CuNi, and true copper coins with no problems. However, in two instances I used acetone on BRONZE coins and experienced a pink-ish discoloration. Again, I’m not a chemist and can’t explain why that happened; I can only guess that perhaps there’s a contaminant in the alloy that doesn’t like acetone.</p><p><br /></p><p>I’ve used acetone on other bronze coins with no ill effect, but to be safe I now only use xylene.[/QUOTE]</p><p><br /></p>

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