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<p>[QUOTE=&quot;Mark Feld, post: 356970, member: 11467&quot;]Many, though certainly not all older coins have been cleaned by one means or another. However, not all cleaning is equal.</p><p>&nbsp;</p><p>For example, while dipping a coin is a form of cleaning, in many cases it is does not do the same type or amount of harm that some other forms of cleaning do. In fact, while there are certain signs to look for, if dipped and neutralized properly, it is often impossible to know if a given coin has been dipped or not.</p><p>&nbsp;</p><p>Due to the reactivity of the metal, nickel coins, and to an even greater degree, copper coins, often react differently/worse to cleaning than gold and silver coins do.[/QUOTE]</p><p><br /></p>

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