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<p>[QUOTE=&quot;Doug21, post: 139190, member: 5650&quot;]The slabs aren&#039;t a vacuum, there&#039;s air in there, even if it were 100% airtight. I think they eventually will turn brown unless you could develop a holder that was a vacuum or filled with an inert gas like nitrogen. I won&#039;t be around to find out though.</p><p><br /></p><p>&nbsp; Didn&#039;t PCGS or one of the services have to buy some copper coins back because spots developed ?&nbsp; I think the case I&#039;m thinking of was a proof Lincoln, common date, super high grade, silly money item. Something like 5k for a coin from the 60&#039;s.</p><p><br /></p><p>&nbsp; Have any early 80&#039;s slabs changed from red to R+B yet ?[/QUOTE]</p><p><br /></p>

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