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<p>[QUOTE=&quot;19Lyds, post: 2417428, member: 15929&quot;]I &quot;used&quot; to use those specific containers..................until one got bumped in the SDB and spilled its contents all over the box. Not much good to me then.</p><p><br /></p><p>Over the passed 44 years, after having collected and stored coins in 2x2&#039;s, storage boxes, safes, and safety deposit boxes in California, Vermont, Texas, and Colorado, I&#039;ve yet to experience any discoloration due to environment or whether or not papers and wood outgassing (I built a fake back in a cabinet in a wet bar with stained plywood and wood standoffs with velcro fasteners) occurred in or around the stored coins. Never.</p><p><br /></p><p>However, I have experienced discoloration on coins due to something which was physically on the coins surface over both short and long periods of time.</p><p><br /></p><p>Slabs are not air tight containers but they are also not open windows in that do not allow air to &quot;flow&quot; freely within the slab. As such, any movement of air within that slab is barely even perceptible.</p><p><br /></p><p>My guess is that whatever is occurring with the OP&#039;s coin is a direct result of something coming in direct contact with that coin before it was slabbed. The only resolution is to have the coin conserved by NGC to properly remove the contaminant. </p><p><br /></p><p>However, since it&#039;s a relatively common proof coin with a relatively common grade I would not concern myself with the expense unless the coin had some sentimental value associated with it.</p><p><br /></p><p>All my opinions are based upon experiences through observation and not scientific fact.[/QUOTE]</p><p><br /></p>

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