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<p>[QUOTE=&quot;GDJMSP, post: 94763, member: 112&quot;]To the best of my knowledge nobody knows exactly how or what NCS does to conserve the coins. But in all likelihood it is a dip of some kind.</p><p><br /></p><p>But there are a great many coins that have been dipped by those individuals with experience and using the right chemical that have also been slabbed by the top grading companies.</p><p><br /></p><p>The problem with dipping comes in when a person uses too harsh a chemical - or they simply dip it for it too long or too many times - and it strips away the surface of the coin. </p><p><br /></p><p>As for other cleaning methods besides dipping - without exception they leave traces of damage.[/QUOTE]</p><p><br /></p>

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