The cards I left out were on the windowsill for about 2 years. The effect isn't quite as large, but they were face up and weren't 67's
The ones that were totally exposed lost a lot of color for all colors except black. The ones partly under others had clear lines where the fading stopped.
The ones in penny sleeves were undamaged, while the penny sleeve itself became too brittle to handle. Ones farther down that stack were only brittle near the edges.
I should put out a couple commons and take pictures of them occasionally.
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