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Message:: [QUOTE="GDJMSP, post: 1835355, member: 112"]The plastic used in the slabs and holders is inert, so the plastic itself has no effect at all. The benefit of the slabs/holders is to reduce air flow, and to protect the coin from contact marks, hairlines, and scratches. But using the just the slab or holder to reduce the air flow is not nearly enough to keep the coin from toning or even slow it down very much. You have to use the other steps involved in proper storage as well. As an example of what I mean consider how many copper coins there are that were slabbed as Red, but today are Red no longer. Based on my own observations I'd say that probably 50%, maybe more, of the slabbed coins designated as Red are today Red Brown. Those coins toned in the slab because they were not properly stored. As for those blast white coins you mention, not long ago they weren't blast white, they were toned. And more than a few of them toned to the point that they were dark brown, black or close to it. You have to understand that 80% or more of all older coins have been dipped to remove all toning at least once in their lives. If it were not for that there would be virtually no blast white coins, except for maybe a few Morgans.[/QUOTE]