Do the cards within the graded slabs degrade or damage over time, lowering the grade
I know everything will eventually degrade or be damaged, but have we seen any of this in the time span that grading has been around, I believe since 1991. Have the cards within the slabs deteriorated or been damaged to lose a grade?
Just curious, if slabbing the 100+ million cards by PSA, BGS, SGC we are seeing data of maybe the slabs themselves having issues, such as yellowing or easily damaged.
Sorry about this question possibly wasting your time, but I do not know allot about grading and felt this was the best group of people to ask my novice question on this subject matter.
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