Film processing temperature - what is the difference?

Discussion in 'B&W: Film, Paper, Chemistry' started by marcello.brussard, Jun 16, 2003.

  1. marcello.brussard

    marcello.brussard Member

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    Sometimes I like to experiment. Saturday I wanted to test a russian rangefinder (please do not laugh) I had just cleaned/tuned and, at evening, went to a nightime flea market near Rome. I took a roll of HP5 and pushed it at 1600.

    Sunday I discovered that I had only some ilfosol left in my cupboard, but even knowing it is not exactly the best for pushed film, I proceded anyway. Yesterday it was so hot in Rome that tap water came out at 30 Celsius and I decided to push the developing temperature to 24 C instead of my usual 20.

    The developed film seems to have a bigger grain and the grey tones have a better balance than what I was expecting.

    Does the developing temperature has influence on grain and tones rendition? hat are your experience?

    Ciao,
    Marcello
     
  2. JHannon

    JHannon Member

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    Hello! sometimes a sudden change in temperature when moving from one solution to another can cause a swelling or wrinkling of the emulsion called reticulation. It makes the grain clump together and appear larger.

    I usually try to keep the temperatures as close as possible from the developer etc.
     
  3. Ole

    Ole Moderator Staff Member Moderator

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    Increasing the temperature will increase the activity of the developer. It will also soften the emulsion a bit more. Both these factors will contribute to slightly coarser grain.

    Pushing HP5 in Ilfosol S will also give coarse grain...

    Most of my MF negatives are FP4, developed in Ilfosol S at 24°C. A beautiful combination...