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<p>[QUOTE=&quot;rlm&#039;s cents, post: 2188502, member: 7957&quot;]That would definitely be my guess.&nbsp; BTW, at least for silver coins, acetone will do no harm provided you use pure acetone.&nbsp; If in doubt, soak it.&nbsp; There is a debate about how safe it is with copper coins, but it, at worst, rarely causes problems.&nbsp; But some coins turn colors, but the exact cause remains open - be it bad acetone, something on the coin, or just the coin itself.[/QUOTE]</p><p><br /></p>

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