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<p>[QUOTE=&quot;GDJMSP, post: 804307, member: 112&quot;]Sure, coin dips are deemed acceptable, as are the solvents that Thad mentioned. But they must be used properly or as I said, even they will not be acceptable. Soaking in distilled water is also acceptable. But that&#039;s pretty much it.</p><p><br /></p><p>There are some proprietary chemicals that are also acceptable if properly used, like Thad&#039;s Verdigone. And the stuff that NCS uses (but nobody knows what those chemicals are).</p><p><br /></p><p>And there are methods used by professional conservators to clean coins recovered from the sea or the ground. But even those are detectable in most cases and thus the coin is forever labeled as harshly cleaned.</p><p><br /></p><p>There are literally thousands of different ways that people use to attempt to clean coins. But if they involve rubbing or wiping or even touching the surface of the coin then they are not deemed acceptable for they will leave traces that can be seen by an experienced eye. And don&#039;t think that just because you can&#039;t see them that they aren&#039;t there - they are.[/QUOTE]</p><p><br /></p>

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