Originally posted by tuco If you use water for a stop bath, make sure you stop it differently than the acid stop bath. Fill the tank up, shake it a few seconds and drain. Repeat 5 or 6 times. I use water for a stop with my Pyro developer which is mandatory; not an option.
The acid stop bath is optional with film but necessary with some print developers, (to avoid print staining).
If you use exotic film like PET based or non prehardened film (like other then Fuji, Kodak or Ilford film) you need to be careful with both acid concentration and temperature shock.
You need to read data sheets.
Ive never used acid stop with film, but hold temperature change to less than 1C.
I always used dilute white wine vinegar with prints, always in house for fried potatoes, or salad dressing, but if you got staining you can always reprint, film transgressions are lost shots.
Noel