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<p>[QUOTE=&quot;desertgem, post: 1759537, member: 15199&quot;]Brian, even though it is a thread of mine from a couple of years, ago, I think it would help you with surface evaluation of a coin. Doug had commented on the flow line on an uncirculated coin, so I presented microscopic evidence of the&nbsp; surfaces so one could see the ridges that produce the luster that is seen as a cartwheel type of effect as one rotate such a coin.&nbsp; Dipping it dissolves a portion of the &#039;peaks&#039; of the flow line and reduces the cartwheel effect. Generally one dip won&#039;t remove it, but as different owners over many decades re-dip it, eventually the little peaks are dissolved flat and a shine is still there, but when rotated, do not show the flashes of light that is the cartwheel effect. Once gone, they can&#039;t be brought back except mechanically such as with a fine wire brush ( whizzing) which is noticeable under magnification.</p><p>&nbsp;</p><p><a href="http://www.cointalk.com/threads/microscopic-comparison-of-luster.126215/" class="internalLink ProxyLink" data-proxy-href="http://www.cointalk.com/threads/microscopic-comparison-of-luster.126215/">http://www.cointalk.com/threads/microscopic-comparison-of-luster.126215/</a>[/QUOTE]</p><p><br /></p>

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