Reminds me of a question I have.
I've got this half-used bottle of Photo-Flo, maybe 10 years old or so that I still use. Just takes a drop in the film tank of water after washing, to do the trick. Anyway, When I take the top off the bottle, it has an ammonia-ish sort of smell that will burn your eyes. When it was new, it didn't smell like anything. But now, it's as dangerous to take a whiff of as sticking your nose up to a bottle of glacial acetic acid and pulling in a big sniff. (well, maybe not THAT bad). BTW--for any dummies reading, never put your nose up to a bottle of glacial acetic acid. You'd probably be better off in the gas chamber when the cyanide pellets fall in the bucket. GAA will kill you if you snort it. Mean stuff.