Can lower quality glass degrade over time even if not used?

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The short answer to this is no.  Glass is glass and takes over a few million years to degrade.  If glass is cracked or something seems it is degrading, this is probably from 1 of 2 causes.

First, it may not have been annealed properly.

Second, it could be that the colors were not compatible and over time it cracked.

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