Are slabs airtight?
I was thinking about this the other day when it comes to slabbed Old Judge cards...
Those cards have organic material on the surface that is basically decomposing very very slowly and releasing tiny amounts of gas (sulfur?). If the air is trapped inside the slab and can't circulate, then it is probably speeding up the decomposition of the images.
I read an article that the Hall of Fame removes all cards from slabs because they're not sure what the long term effects are.
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