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<p>[QUOTE=&quot;desertgem, post: 657165, member: 15199&quot;]I know it is not very nice to refer to threads on another forum, but I think this group of threads, if read carefully, and more than once, could provide more knowledge on AT/NT decision making than any other written material. It also would help to see thousands of slabbed highly toned coins, but remember that many AT coins probably have been slabbed years ago before the increase in questionable color returns from the the TPG of late.</p><p>I have read these and printed them out, and tried to practice taking a coin through the progressions , but it is time consuming and somewhat difficult, but if you read and practice, you can do very well.&nbsp; I have said before that AT and NT can&#039;t be positively identified when done by a highly skilled doctor, but these will help, especially on the lesser skilled doctors.</p><p><br /></p><p>Jim</p><p><br /></p><p><br /></p><p><a href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=304983&amp;highlight_key=y&amp;keyword1=toning" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=304983&amp;highlight_key=y&amp;keyword1=toning" rel="nofollow">http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=304983</a></p><p><br /></p><p><a href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=708296" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=708296" rel="nofollow">http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=708296</a></p><p><br /></p><p><a href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=708592" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=708592" rel="nofollow">http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=708592</a></p><p><br /></p><p><a href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=716279&amp;highlight_key=y&amp;keyword1=color" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=716279&amp;highlight_key=y&amp;keyword1=color" rel="nofollow">http://forums.collectors.com/messageview.cfm?catid=26&amp;threadid=716279</a></p><p>&nbsp; if you only read one, do this one for the correct progression of colors through each stage of thin film deposit causing the toning.[/QUOTE]</p><p><br /></p>

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