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<p>[QUOTE=&quot;GDJMSP, post: 162485, member: 112&quot;]If a coin is dipped properly you can&#039;t detect it 15 minutes later let alone 15 yrs later. Dipping a coin does not always harm the coin to the extent that it can be seen - over-dipping does harm the coin. And NO, I am not advocating dipping coins. Most of you know me better than that. I&#039;m just saying that it is not always detectable - other than by deductive reasoning anyway. </p><p><br /></p><p>But if a coin is harshly cleaned and then allowed to retone naturally over the years - yes that is still detectable.[/QUOTE]</p><p><br /></p>

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