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<p>[QUOTE=&quot;physics-fan3.14, post: 3251341, member: 19165&quot;]Acetone removes foreign (organic) impurities from the surface of a coin, but doesn&#039;t touch the underlying metal. Thus, it is considered to be &quot;conserving&quot; a coin. </p><p><br /></p><p>When you &quot;clean&quot; a coin, you disrupt the actual metal of the coin - dipping, polishing, brushing, etc. </p><p><br /></p><p>Acetone is perfectly safe for silver and gold. There are many wild rumors that it will hurt copper, but I&#039;ve never seen any proof. </p><p><br /></p><p>I am currently conducting experiments to determine it&#039;s effects on aluminum coins. The jury has not yet reached a verdict on that one.[/QUOTE]</p><p><br /></p>

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