Home made D76 with raw chemistry?

[Bill Burk]

Hydroquinione is a "dangerous chemical" and is "restricted for transport" because of it's toxicity to aquatic life, NOT necessarily human life.

It's because when you spill it into a lake, it kills *everything*. Not because it kills *you*.

NIH has a nice write up about it. Mentions catechol so I guess other developing agents like Pyro may also raise the same concerns.

 

[Bill Burk]

Mallinckrodt Chemical Works - The Chemistry of Photography - 1940

A little sulfite. “it is general practice”.

So I guess this has been known more than a hundred years.