Before the rush

Before the rush
by evan-pak

Submit your Photo
Hall of Fame

Please participate in Meta
and help us grow.

Photography Stack Exchange is a question and answer site for professional, enthusiast and amateur photographers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm very unfamiliar about color chemistry at all. I use different films and developers for my needs in B&W. There is only one constant is my workflow. I always use:

  • Ilford Ilfostop Indicator stop bath which is originally orange when concentrated and yellow when diluted
  • Ilford Rapid Fixer is transparent but I suppose some amount of stop bath mixed into fixer

Recently I decided to wash out some silver from my very old spoiled color films with outdeveloping them. I've just put my films to black and white fixer.

Unexpectedly fixer changed it's color to purple. So I'm but surprised about this:) What may root cause of this? Is it stop bath indicator reaction on color film or just washed dye?

Main question Is my fixer still usable? I know fixers are very resistant to pollution by other chemistry.


share|improve this question
up vote 0 down vote accepted

How purple is it?

Indicator stop solution will turn purple when it's used up, i.e. when the pH gets above a certain threshold. It sounds like some of the stop bath found its way into your fixer and changed color due to the higher pH of the fixer.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.