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<p>[QUOTE=&quot;leaconcen, post: 1283784, member: 31684&quot;]Whatever the reaction is, I have seen for myself that cooper or brass seems to react negatively more often than the other metals.&nbsp; Maybe it is oxidized copper that is reacting to the acetone.&nbsp; I will use the acetone on the metals that seem to react to it less.&nbsp; As a medal collector who buys white metal among other metals, I have found using acetone valuable in cleaning off the residue often left on the surface.[/QUOTE]</p><p><br /></p>

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