This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
As you may recall, a number of the classier 5.25" diskette brands employed (still employ?) a lubricant on their jacket liners. While the lube worked to reduce drag and noise, it also, evidently, served as a growth medium for a particularly nasty plastic and/or oxide-eating fungus! It's probably a good idea to check each of your old diskettes. Immediately backup any diskettes with splotchy discolorations. ----------------------------
 
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