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<p>[QUOTE=&quot;Lehigh96, post: 2520249, member: 15309&quot;]You are going to have people tell you that intent matters, and I will tell you the reason that it doesn&#039;t.&nbsp; Whenever you look at a coin, the only information you have, is the appearance of the coin.&nbsp; There is absolutely no way to determine the intent of the previous owner.&nbsp; Therefore, you must judge the originality of the toning by comparing it to the typical color schemes and patterns found on that particular type of coin.&nbsp; Use indicators of natural and artificial toning to help make your determination.&nbsp; Some indicators would be proper color progressions, toning correspondence, elevation chromatics, pull away toning etc.</p><p><br /></p><p>As a starter, please read the article linked below by Jason, Physics-fan3.14.</p><p><br /></p><p><a href="https://www.cointalk.com/threads/what-you-need-to-know-about-the-science-of-toning.84670/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/what-you-need-to-know-about-the-science-of-toning.84670/">What You Need to Know About: The Science of Toning</a></p><p><br /></p><p>And to answer your question, the TPGs really don&#039;t use NT or AT.&nbsp; They mostly use MA (market acceptable) and QT (questionably toned).&nbsp; Toning is not a black and white determination.&nbsp; It is better to think of it as a sliding scale with QT (AT) to the far left, and MA (NT) on the far right with the middle representing the coins that are difficult to classify.&nbsp; I once made a visual representation of such a scale using Jefferson Nickels (see below).</p><p><br /></p><p><img src="http://i117.photobucket.com/albums/o59/ACPitBoss/Jefferson%20Nickels%20Raw/ToningScale.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p><img src="http://i117.photobucket.com/albums/o59/ACPitBoss/Jefferson%20Nickels%20Raw/ToningScaleFirst.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><img src="http://i117.photobucket.com/albums/o59/ACPitBoss/Jefferson%20Nickels%20Raw/ToningScaleLast.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>I hoped this helped answer your question.</p><p><br /></p><p>Paul[/QUOTE]</p><p><br /></p>

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