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<p>[QUOTE=&quot;rhoggman, post: 386705, member: 13987&quot;]Don&#039;t get too amazed.... PCGS and NGC cannot stop the forces of nature. Remember the inscription on the Titanic? &quot;Even God cannot sink this ship.&quot; The grading services do thier best to make sure the coin does not have any issues, and then they try to perserve the coin. This is why they garuntee their &quot;GRADE&quot;. They do not really garuntee the &quot;COIN&quot;. Therfore if the grade comes into question you have the opportunity to make the TPG stand on their word. </p><p>&nbsp;</p><p>Personally I would just try to get my money back, and find a coin that you will not regret buying.</p><p>&nbsp;</p><p><b>-FYI on copper oxididation-</b></p><p>&nbsp;</p><p>Initially, bare Cu metal atoms react with air to form the pink oxide, cuprite, Cu2O, which has Cu+1 cations. This gradually oxidizes further to the black oxide, tenorite, CuO, with Cu+2 ions. The black sulfide CuS also sometimes forms. In the presence of moisture, the blackish layer slowly reacts with sulfur dioxide and carbon dioxide from the air to eventually form the patina, which is a mixture of 3 minerals:</p><p>brochantite, a green, hydrated copper sulfate, Cu4SO4(OH)6 </p><p>malachite, the green, hydrated copper carbonate Cu2CO3(OH)3</p><p>azurite, the blue, hydrated copper carbonate Cu3(CO3)2(OH)2</p><p>In these compounds, copper atoms from the metal surface have been fully oxidized into Cu+2 (cupric) ions. The rate of patina formation and the proportion of the components depend upon humidity and the amount of air pollution. In European cities, where sulfur-containing coal has been burned for centuries, brochantite predominates on older copper roofs and statuary. In rural environments elsewhere, malachite may predominate. <a href="http://www.copper.org" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.copper.org" rel="nofollow">http://www.copper.org</a>[/QUOTE]</p><p><br /></p>

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