Plain hypo bath as fixer?

Discussion in 'B&W: Film, Paper, Chemistry' started by DavidBrunell, Dec 24, 2012.

  1. DavidBrunell

    DavidBrunell Member

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    I just realized I have been using a "plain hypo" bath of sodium thiosulfate as a fixer for my last 20 FB prints. Will this be OK or should I re-fix in a different fixer solution?
     
  2. Gerald C Koch

    Gerald C Koch Member

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    Should be OK. But in the future a "plain hypo" fixer also contains sodium sulfite which makes it keep longer without sulfurizing from acid carryover from the stop bath.
     
  3. DavidBrunell

    DavidBrunell Member

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    Thank you Gerald. It may have? Labeled Hypo by Zone VI...But I am erroring on the side of caution and want to make sure.
     
  4. David Lyga

    David Lyga Subscriber

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    Gerald, I also use plain sodium thiosulfate (penta, usually) and I find it works fine. But, if I use a weak stop bath (1%) and change it frequently, do you still recommend the necessity of the sulfite, even though I do not usually reuse the fixer after the session? (I use small liquid quantities for prints so that I can discard without wasting.) No problems yet. - David Lyga
     
  5. Alessandro Serrao

    Alessandro Serrao Member

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    Or just use a brief rinse after the acidic stop bath, if you don't want to use sodium sulfite in the fixer and still want to reuse it.
     
  6. Gerald C Koch

    Gerald C Koch Member

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    If you have not seen any sulfurization with your process then I wouldn't worry. However a 3% acetic acid stop might cause problems.

    A good "plain" hypo bath would be 240 g sodium thiosulfate pentahydrate and 15 g sodium sulfite to make 1 liter of fixer.
     
  7. juan

    juan Subscriber

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    It's been more than 20-years, but I think Hypo from Zone VI was plain hypo, while fixer with other ingredients was labeled Zone VI Fixer.
    juan
     
  8. cliveh

    cliveh Subscriber

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    Nothing wrong with sodium thiosulfate, but fixation may take a little longer.
     
  9. George Collier

    George Collier Member

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    Juan is correct about the two products, they sold plain hypo for use with selenium (and maybe other types of) toning and fixer for actual fixing of film and paper.
    I believe some of the other components in a fixer bath also extend the life of the solution, like keeping dissolved silver salts in solution, preventing precipitates.

    Maybe PE will pick up this thread and give us a better explanation.