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<p>[QUOTE=&quot;rhoggman, post: 386701, member: 13987&quot;]<b>I see Green on the Wheat Stalks</b></p><p><br /></p><p>I can see some green on the wheat stalks, and the black spots can also be an earlier stage of oxidation. </p><p>&nbsp;</p><p>The problem is if you did not have the coin slabbed by NGC how do you know what it looked like at the time of slabbing/ grading? You don&#039;t.</p><p>&nbsp;</p><p>If you keep a copper coin that has begun the oxidation process your only recourse in the future is to send it back to NGC if you believe the grade has actually went down since it&#039;s time in the holder. If your coin is XF 45, and you believe that grade is no longer acurate, NGC will pay you the difference if they aggree. PCGS will buy your coin back from you. (NGC may do this as well in some circumstances)</p><p>&nbsp;</p><p>The good news is that the oxidation should not be able to continue in a sonically sealed holder. If new atmosphere cannot enter the space your coin inhabits then the process has a limited ability to destroy your coin. </p><p>&nbsp;</p><p>If there is a chemical of some type on the coin causing any type of process to take place (doubtfull), who knows what could happen to it. Either way NGC has garunteed the grade. </p><p>&nbsp;</p><p>The smartest option would be to opt for purchasing a problem free coin. Something without dirt, signs of oxidation, or other issues. Whenever you are dealing with copper this is extremely important.</p><p>&nbsp;</p><p>When the grading services first started they were reluctant to garuntee copper coinage because issues like this do arise.</p><p>&nbsp;</p><p>You probably don&#039;t have to worry much with your coin, but it would always be better to have one without small areas of oxidation, or built up residue.[/QUOTE]</p><p><br /></p>

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