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<p>[QUOTE=&quot;mrweaseluv, post: 1816513, member: 40340&quot;]Yup I was too slow jumping on this one.</p><p>the spots themselves are caused by impurities in the gold planchet, bits of iron or copper (possibly even from micro die chips that were imbedded during the minting process) over time these oxidize or corrode causing the spotting. As these are inherent to the coin/planchet itself no storage method short of an oxygen free environment is going to stop them from progressing.</p><p>Late with the answer and it has all pretty much been said already, but this was how it was explained to me years ago.[/QUOTE]</p><p><br /></p>

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