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<p>[QUOTE=&quot;David Setree Rare Coins, post: 2240842, member: 74719&quot;]It doesn&#039;t matter if the slab is air tight or not. The plastic that the slab is made of is semi-permeable to many chemicals. they pass right through the plastic itself. Sulfur is one of them. I have slabs coins that were 100% red as made and they have toned to a deep orange over the years (some even darker!) even though they were kept in humidity controlled areas and protected well against chemical contamination. I would never, personally pay a premium for an original red coin that hasn&#039;t a &quot;skin&quot; of some kind of toning on it.[/QUOTE]</p><p><br /></p>

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