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<p>[QUOTE=&quot;physics-fan3.14, post: 3251376, member: 19165&quot;]Doug alleges this reaction occurs. If you actually search the CT archives, all you&#039;ll see are unspecific, unverified, rumors of claims. I have furthermore never seen photographic evidence of this reaction. I have never seen a chemical proof of why this reaction could or should occur under normal use of acetone. Doug claims that he&#039;s read many, many reports from a wide variety of sources which claim it has happened, and that he&#039;s seen it himself. I would be very interested in reading some of these claims, [USER=112]@GDJMSP[/USER] , if you could link them here, or provide references to articles we can read?</p><p><br /></p><p>I personally have used acetone on dozens of copper coins, and never once seen an adverse reaction. I&#039;ve done it on circulated, uncirculated red, and uncirculated brown. Never once have I seen any adverse reaction.</p><p><br /></p><p>All I have ever seen is Doug claim that it has happened occasionally, and cite unspecific rumors that he has heard of it happening. Sorry, but this is not enough evidence for me to go on. If Doug can back up his claims with photographs, or if someone else can prove that it has happened, then I will believe it. Until then, I maintain that acetone is perfectly safe for copper.</p><p><br /></p><p>That doesn&#039;t mean it can&#039;t happen, of course - you cannot prove a negative. Doug is right in that... anything is possible. All I&#039;m saying is, I&#039;ll believe it when I see it.[/QUOTE]</p><p><br /></p>

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