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<p>[QUOTE=&quot;Treashunt, post: 241608, member: 6763&quot;]mdev:</p><p>&nbsp;&nbsp; 1) pvc residue is from the degrading of the plastic over time. It is not inert, meaning that it stays the same and does not degrade. </p><p>&nbsp; 2) an ultrasound will/can damage the coin.</p><p>&nbsp; 3) and, no, I have never used it, although it may be good for metal detecting coins.[/QUOTE]</p><p><br /></p>

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