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<p>[QUOTE=&quot;Stork, post: 24579302, member: 71642&quot;]Other than acetone I would NOT try any new-to-you product on any kind of nicer coin.&nbsp; </p><p><br /></p><p>If this is a nicer coin then either send it to a service like NCG has OR get a whole bunch of the common variety coins to test on the metal first. </p><p><br /></p><p>Don&#039;t make your nice coin the guinea pig.&nbsp; </p><p><br /></p><p>IMO it&#039;s perfectly fine to remove a surface contaminant (&#039;wash&#039; the coin) vs. anything more aggressive intended to &#039;improve&#039; it above it&#039;s baseline or nature.[/QUOTE]</p><p><br /></p>

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