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<p>[QUOTE=&quot;GDJMSP, post: 1574957, member: 112&quot;]Are you reasonably certain that you can always tell a problem free coin from a problem coin ? Many cannot.</p><p><br /></p><p><br /></p><p><br /></p><p>Assuming the coins are problem free coins and depending on what is on the coin, soaking in distilled water or xylene. That&#039;s it, nothing else.</p><p><br /></p><p>Some will tell you that you can also use acetone with copper, I will tell you not to risk it.[/QUOTE]</p><p><br /></p>

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