Question re developer chemistry

Discussion in 'Darkroom Developing and Printing' started by Jorge Omar, Jul 22, 2003.

  1. Jorge Omar

    Jorge Omar Guest

    Hello,

    If one looks at Crawley's FX-37 formula:

    - There are two alkalis - sodium carbonate and borax.
    - There are two restrainers - benzotriazole and potassium bromide
    (that, AFAIK, is not effective with phenidone).

    Would someone guess why?

    Thanks,

    Jorge
     
    Jorge Omar, Jul 22, 2003
    #1
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  2. Hi Jorge,

    I use FX-37 a lot, especially when I have been photographing low light
    images (e.g., night scenes). What I find is that FX-37 brings up shadow
    values on the negative significantly. I would guess that the purpose
    of the two restrainers is to keep highlight values from building up
    excessively while the low values are being developed.


    Francis A. Miniter
     
    Francis A. Miniter, Jul 22, 2003
    #2
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  3. Anchell and Troop, The Film Developing Cookbook.


    Francis A. Miniter
     
    Francis A. Miniter, Jul 23, 2003
    #3
  4. Jorge Omar

    Jorge Omar Guest

    Thanks, Richard

    It makes sense, since hydroquinone is active in this formula, and I've
    seen postings re bromide also increasing accutance, one of the
    formula's targets.
    Let's wait and see when I get some of it if there's a significant
    change.

    Jorge
     
    Jorge Omar, Jul 24, 2003
    #4
  5. Jorge Omar

    John Guest


    Crawley's FX-37


    Water 750.0ml
    Sod.Sulfite 70 g
    Phenidone0.5 g
    Hydroquinone5.0 g
    Sod.Carbonate 5.0 g
    Borax2.5 g
    Pot. Bromide0.5 g
    Benzotriazole 1%5 ml
    Water to make 1.0 L

    From my site of course ;>)

    Regards

    John S. Douglas, Photographer
    http://www.darkroompro.com
     
    John, Jul 25, 2003
    #5
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