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<p>[QUOTE=&quot;johnmilton, post: 3591762, member: 101855&quot;]Copper experts, who are better than I, have methods to arrest this stuff. At any rate the coin will never get a straight grade because the damage has been done. This is BIG PROBLEM with cleaning copper. The &quot;restorative process&quot; is often not pretty.</p><p><br /></p><p>Years ago, I saw two PCGS certified Proof Indian Cents, in a dealer’s inventory, turn to dust in the holder. The submitter had dipped them to make them red again, and PCGS graded them. The trouble is the coin doctor had not gotten the dip off the coins, and it kept on eating the metal.[/QUOTE]</p><p><br /></p>

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