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<p>[QUOTE=&quot;SuperDave, post: 2406056, member: 1892&quot;]It should also be noted that Doug Kurz (the man who assembled what he called the Sunnywood Collection) explored the toning process in <b>excruciating</b> scientific depth, and defined the color progression of thin-film interference, giving us a valuable tool for evaluating the originality of toning on silver coins. Here&#039;s more than you&#039;ll ever want to know about toned silver:</p><p><br /></p><p><a href="http://www.jhonecash.com/research/sunnywood_classification.asp" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.jhonecash.com/research/sunnywood_classification.asp" rel="nofollow">http://www.jhonecash.com/research/sunnywood_classification.asp</a>[/QUOTE]</p><p><br /></p>

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