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It's actually been found that some plastics will yellow even in the absence of light (still in the package) just from the fire retardant chemicals used in their processing.
People will open up vintage computers that have been stuffed into a box for 40 years and find them just as brown as something that's been out on a desk
It's unclear as to whether or not it requires UV to start the reaction that results in the yellowing, and the vintage electronics community is still trying to understand why some things stay retro brighted and others do not
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