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<p>[QUOTE=&quot;satootoko, post: 140538, member: 669&quot;]Only NCS will do anything to alter the surface and appearance of a coin.&nbsp; Their &quot;conservation&quot; techniques are extremely sophisticated cleaning methods, which should be used primarily for coins that are in the early stages of environmental damage.&nbsp; If there has been extensive environmental damage, such as copper verdigris, even NCS&#039; techniques will frequently reveal surface damage that will devalue the coin.</p><p><br /></p><p>Never forget that except in the case of PVC slime, the absolute&nbsp; <u>only</u> way to alter a coin&#039;s appearance is to alter its surface, which means make it less original, which means make it worth less (and sometimes worthless).[/QUOTE]</p><p><br /></p>

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