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LaserDisc
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==== Laser rot ==== {{Main|Disc rot#Laser rot}} Many early LaserDiscs were not manufactured properly. The adhesive that was used contained impurities which were able to penetrate the lacquer seal layer and chemically attack the metalized reflective aluminum layer, altering its reflective characteristics. This, in turn, deteriorated the recorded signal. This was a problem that was termed "laser rot" among LaserDisc enthusiasts (also called "color flash" internally by LaserDisc pressing plants). Some forms of laser rot could appear as black spots that looked like mold or burned plastic which caused the disc to skip and the video to exhibit excessive speckling noise. But, for the most part, rotted discs could actually appear perfectly fine to the naked eye. Later optical standards have also been known to suffer [[Disc rot|similar problems]], including a notorious [[Compact disc bronzing|batch of defective CDs manufactured by Philips-DuPont Optical]] at their Blackburn, Lancashire facility in England during the late 1980s/early 1990s.
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