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<p>[QUOTE=&quot;Insider, post: 2903689, member: 24314&quot;]<span style="color: #660066">When I posted: &quot;It all depends on what &quot;<b><span style="color: #000000">BLACK</span></b>&quot; is.&quot;</span>&nbsp; GDJMSP, posted: &quot;I agree, but then that is just another way of saying the same thing I said - namely that there is no way one can know if black toning is truly terminal or not unless and until you remove it.&quot;</p><p><br /></p><p><span style="color: #660066">I should have been more specific.&nbsp; I learned that in a conservation setting, the surface of the black area is examined using a stereo microscope.&nbsp; By doing that, in most cases, conservators are able to tell the condition of the underlying surface.&nbsp; If the surface was etched, it was best to leave the coin alone. If the surface was black, yet still in good condition - often retaining its original luster - it was worth a try.&nbsp; </span></p><p><span style="color: #660066"><br /></span></p><p><span style="color: #660066">If we look at the vast majority of rainbow toned coins, the terminal black toning is on the edge and rim.&nbsp;&nbsp; These coins are highly prized even though their edge and rim is <span style="color: #000000">terminally CORRODED</span>.&nbsp; </span>[/QUOTE]</p><p><br /></p>

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