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<p>[QUOTE=&quot;Leadfoot, post: 292691, member: 2972&quot;]Yes, they can and have changed color in the slab.&nbsp; Remember, no slabs are airtight.&nbsp; </p><p><br /></p><p>FYI, the possibility of copper turning color is a large part of the reason why NGC has a limit on their color guarantee for copper, and, incidentally, why buying RB and RD copper from PCGS is in many ways a wiser choice than NGC (or ANACS/ICG/etc.)...Mike[/QUOTE]</p><p><br /></p>

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