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Old 12-03-2012, 06:52 PM   #4
Join Date: Jul 2009
Posts: 7,543

Well, assuming you don't store psychedelic mushrooms in your stringing tray, I would presume that your tray was made with some form of a fumarate. Fumaric acid is used to make some polyester resins, which, when combined with isopropyl compounds creates a purple-blue substance. Since your tray looks like it's rather old, I would presume that's what happened.
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