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<p>[QUOTE=&quot;Detecto92, post: 1447351, member: 75105&quot;]Why does it seem like only mint state and au coins produce lustrous toning? </p><p><br /></p><p>Take an old silver coin, say like 1870s, and if it&#039;s a proof, ms, or au, it&#039;s most likely has very nice rainbow toning.</p><p><br /></p><p><img src="http://images.suite101.com/2682824_com_1869pf66ob.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p><br /></p><p>But once it wears down, it usually does not do this.</p><p><br /></p><p><br /></p><p><img src="http://i.ebayimg.com/t/1872-Liberty-Seated-Dollar-Very-Good-/00/$(KGrHqMOKkME0bJlhHc(BN,TdId0sw~~_3.JPG" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p>So...does the wearing down of the coin, and loss of mint luster do this? Or do the oils from humans handling the coin prevent rainbow toning from happening.[/QUOTE]</p><p><br /></p>

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