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<p>[QUOTE=&quot;cpm9ball, post: 2197509, member: 24633&quot;]Telling the difference between NT &amp; AT is still a bit subjective. Of the two biggest grading services, NGC &amp; PCGS, I&#039;ve had coins submitted to NGC deemed AT but when submitted to PCGS, deemed NT and vice versa.</p><p><br /></p><p>I&#039;m not an expert, so someone can chime in if I&#039;m wrong, but in simple terms, natural toning occurs when a chemical bonds with a reactive metal over a period of time while artificial toning appears to be &quot;painted&quot; on the surface.</p><p><br /></p><p>Chris[/QUOTE]</p><p><br /></p>

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