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<p>[QUOTE=&quot;GDJMSP, post: 24654134, member: 112&quot;]Those are the basic ingredients of what is commonly called coin dip, or at least some of them. And yes the TPGs, all of them, absolutely use coin dip of one form or another. So do a great many coin dealers and knowledgeable collectors. And yes it has to be neutralized after being used.</p><p><br /></p><p>Coin dip has been used by basically the entire numismatic community for 200 years or so. And when used properly it does no harm to the coin. But way beyond that, proper dipping of coins has saved countless numbers of them from almost certain destruction. It wasn&#039;t for coin dip, we wouldn&#039;t have most of the coins we have now !</p><p><br /></p><p>As I have said many times, it is estimated by some of the most knowledgeable people there are in numismatics that 80% or more of all older coins, including all those graded and slabbed by the TPGs, have been dipped, at least once in their lifetimes.[/QUOTE]</p><p><br /></p>

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