All photo chemicals have hazards.
The best in the WORLD printer I ever met had a left hand like a lobster from all the chemicals he had sloshed over it from the years of processing in trays.

*he used to print for Sarah Moon...if anyone could find out who he was or if there is anything on the Net about him I'd be v grateful...he was based in a house in Fulham and called Bill Robinson (but prolly not...I ferget
) ...or somesuch.