FX-37 modification.

Discussion in 'Darkroom Developing and Printing' started by Keith Tapscott, Oct 14, 2005.

  1. I don`t know if anybody makes their own FX-37, but they might be interested
    to know that Geoffrey Crawley has made a small change to the original
    formula.
    The only difference between this and the original formula is an increase of
    Potassium Bromide from 0.5 gram to 1 gram per litre and the omission of
    Benzotriazole which can be difficult to dissolve.
    (Published in the Amateur Photographer, dated 15th October 2005).
     
    Keith Tapscott, Oct 14, 2005
    #1
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  2. Hi Keith,

    What different effects are to be noticed in the film?


    Francis A. Miniter
     
    Francis A. Miniter, Oct 14, 2005
    #2
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  3. According to Crawley, none. The changes made are to make the stock solution
    easier to prepare for the amateur hobbyist. Benzotriazole was originally
    included for the conditions of professional reuse as fog levels can rise.
    Although not stated in the article, I assume the starting point developing
    times remain unchanged.
    It finally states that the change has no effect on image quality.
    Geoffrey Crawley uses Ilford Delta 100 as one of the films for testing lens
    resolution that he test for the magazine along with a Fuji colour film,
    although I can`t remember which one.
    I hope this of use to you Francis.
     
    Keith Tapscott, Oct 14, 2005
    #3
  4. Keith Tapscott

    UC Guest

    There can be a tiny difference between these restrainers, but for all
    practical purposes it can be ignored.
     
    UC, Oct 14, 2005
    #4
  5. I made some up tonight using this modification.


    Francis A. Miniter
     
    Francis A. Miniter, Oct 16, 2005
    #5
  6. I don`t make my own processing chemicals although I know that many people on
    this newsgroup do and it is an interesting subject, which is why I reported
    the slight change to the formula.
    One person who tried FX-37 with Delta 100 complained that his negatives were
    too thin and flat. This person found the Paterson FX-39 developer to work
    very well indeed and was surprised at the difference in quality. Geoffrey
    explained that the two developers are not related and FX-39 was formulated
    to provide very full emulsion speed.
    Apparently with FX-37, the film benefits from slightly more generous
    exposure of perhaps one-third to two-thirds or half a stop in practice. The
    developing times of course are starting points and should be adjusted to
    yield the desired contrast for the photographers usual paper grade.
    Please report your experience with FX-37.
    Thanks.
     
    Keith Tapscott, Oct 16, 2005
    #6

  7. I used this mix to develop some 4x5 pictures I took yesterday inside a pub. The
    owner had furned up the lights to help, but, of course, a pub still remains
    dark. I used TMY and the exposures were made for 2 seconds at f/4.7, with an
    old Kodak 127 mm lens. The reason I chose FX-37 was that I wanted to ensure
    maximum development in the shadow areas.

    I rotary processed the films, two at a time, in 100 ml. of FX-37 at a 1:3
    dilution for 9 minutes, with water rinse and alkaline fixer. The results were
    superb. Shadow detail was beyond my best hopes.


    Francis A. Miniter
     
    Francis A. Miniter, Oct 16, 2005
    #7
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