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<p>[QUOTE=&quot;HawkeEye, post: 3237436, member: 86305&quot;]The best analysis and explanation of toning I have run into was by Doug Kurz who I believe put together the Sunnywood collection of Morgans.&nbsp; I have explanation of and links to PDFs on toning that can be accessed here <a href="http://www.1881o.com/toned-coins.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.1881o.com/toned-coins.html" rel="nofollow">http://www.1881o.com/toned-coins.html</a> </p><p><br /></p><p>The beauty of Doug&#039;s work is that he explains the progression of toning and what should be there with toned coins.&nbsp; You can tone any coin with the right chemicals, but coins that tone slowly over an extended period just take on a different look and the toning progression is almost always there.&nbsp; Doug also does some work to differentiate bag toning from other color so that one can try to see the difference.</p><p><br /></p><p>This is the only person I have seen publish scientific work on toning in recent years.&nbsp; The Sunnywood collection brought record prices and shows the premium some collectors put on certified toned coins.&nbsp; Even the TPGs can be fooled, but when I am buying a toned&nbsp; coin I only by ones in holders.&nbsp; While not perfect it is at least one line of defense.[/QUOTE]</p><p><br /></p>

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