Many years ago when I was new to photography I loaded a roll from my Retina 1, bought used I assure you, into one of the old Kodak tanks with the lasagna-like acetate separator. This detail is not intrinsic to the story, but merely to indicate how long ago it was!
Since acid fixer or hypo has a smell much like pickles, I hadn't properly labled the developer bottle and the fixer bottle. After all, tell by the smell!
Well, that day I had a cold, and the fixer was fresh. Yep, fresh fixer will clear film in a heartbeat!
Ever since then I've tried to lable things clearly.