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<p>[QUOTE=&quot;Mark Feld, post: 952824, member: 11467&quot;]Whether NT is &quot;just that&quot; or not, depends upon how those actions are performed and what your working definition of &quot;NT&quot; is.&nbsp; </p><p><br /></p><p>Following is the best definition for &quot;NT&quot; and &quot;AT&quot; I have seen, though none will ever be close to perfect:</p><p><br /></p><p>&quot;Natural toning is the formation&nbsp; of oxides, sulfides, or other compounds on the surfaces of a coin as the&nbsp; result of gaseous compounds that are present in the ambient atmosphere&nbsp; where coins are placed (1) for purposes consistent with their intended&nbsp; use in commerce, or (2) for storage in a manner traditionally accepted&nbsp; by numismatists.</p><p><br /></p><p>Artificial toning is the formation of oxides,&nbsp; sulfides, or other compounds on the surfaces of a coin by any process&nbsp; other than that which causes natural toning.&quot;[/QUOTE]</p><p><br /></p>

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