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<p>[QUOTE=&quot;GDJMSP, post: 1467410, member: 112&quot;]No, it isn&#039;t. And it is not circular reasoning. When you harm a coin (harshly clean a coin) it can be seen.</p><p><br /></p><p>When you clean a coin, it cannot be seen because there is nothing <u>to see</u>.</p><p>&nbsp;</p><p><br /></p><p><br /></p><p>Yes, they do. It&#039;s because skin oils have an acid in them. That is why if fingerprints on a coin are more than a few days old, they become physically etched into the surface of the metal.</p><p>&nbsp;</p><p><br /></p><p><br /></p><p>No, neither one is. Neither is xylene.</p><p><br /></p><p><br /></p><p><br /></p><p>Light can cause color changes but it will not alter the surface of the coin like friction does.[/QUOTE]</p><p><br /></p>

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