Quote Originally Posted by fotoobscura View Post
Could you please humor me and explain to me why it's not good practice to rinse between developer and bleach?
In theory some residue of developer will benefit the bleach bath as it creates the right pH. In practice if you want to reuse bleach without polluting it the better solution is an "acid stop" bath which serves both purposes, make an acid environment and avoid polluting bleach with developer. That's what I read here on APUG. Your mileage may vary.

"Acid stop" can either mean acetic acid or citric acid.

From my notes:
Acetic acid: economical, effective, not risky for the film, dangerous for persons, polluting, stinking, reusable, well preserved; can be used more times when diluted at 2%. For one-shot better using 1% or 1.5% dilution.

Citric acid: more expensive, not dangerous, odourless, must be used on the same day of dilution, and some people report the possibility of problems (my notes not very specific).

I chose acetic acid. I still have to perform my first C-41 bath, my "chemistry" is still sealed. Hope I'll do it in the next few weeks.