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<p>[QUOTE="kanga, post: 753938, member: 9270"]Of the coining metals used by the US, copper is the most reactive.</p><p>(Yes, I'm ignoring zinc since there is only one year that has zinc on the outside, the 1943 cents.)</p><p>Actually the PCGS move doesn't surprise me. And frankly I consider it reasonable.</p><p> </p><p>On the other hand the main problem for silver is sulfur, not oxygen.</p><p>So a moist climate alone is not enough to significantly tone silver as quickly as copper.</p><p>Plus not many (any?) TPGs have designators for toning on silver anymore.</p><p>The "W" is no longer used by NGC. (Do they still use the "star" anymore?)</p><p> </p><p>Bottom Line: PCGS <u>had</u> to cancel their position with regard to RD and RB copper.[/QUOTE]</p><p><br /></p>
[QUOTE="kanga, post: 753938, member: 9270"]Of the coining metals used by the US, copper is the most reactive. (Yes, I'm ignoring zinc since there is only one year that has zinc on the outside, the 1943 cents.) Actually the PCGS move doesn't surprise me. And frankly I consider it reasonable. On the other hand the main problem for silver is sulfur, not oxygen. So a moist climate alone is not enough to significantly tone silver as quickly as copper. Plus not many (any?) TPGs have designators for toning on silver anymore. The "W" is no longer used by NGC. (Do they still use the "star" anymore?) Bottom Line: PCGS [U]had[/U] to cancel their position with regard to RD and RB copper.[/QUOTE]
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