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<p>[QUOTE=&quot;V. Kurt Bellman, post: 2118844, member: 71723&quot;]The essential difference between AT and NT, the one that MATTERS, is intent, not time. That strikes me as an awfully important, yet difficult to prove, thing. Natural toning can happen fast, but usually doesn&#039;t. Artificial toning is usually fast, but not necessarily. At any rate, resting the distinction on &quot;intent&quot; raises the same problems that criminal offenses requiring the element of intent do - really difficult to prove. All we have, whether at NGC or PCGS or Vic&#039;s cabinet, or wherever is educated guesses. We can HOPE there is more education than guess in the process, but I am somewhat skeptical of that. I smell a whole lot of guess wrapped up in reputation that may or may not be fully deserved.[/QUOTE]</p><p><br /></p>

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