HOW TO FIND OUT PROCESSING TIMES FOR ANY FILM IN ANY DEVELOPER - is this true?

Discussion in 'B&W: Film, Paper, Chemistry' started by TheToadMen, May 9, 2013.

  1. TheToadMen

    TheToadMen Subscriber

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    I read a discussion on finding developing times for WEPHOTA NP 22 (4x5"), where some gave this simple method to determine developing times:

    (source: http://photo.net/black-and-white-photo-film-processing-forum/00b4nz)

    I was wondering: could it really be that simple? Not exact science - I know - but if it works a good method to find a starting point for any unknown film.
    Has anyone actually tried this?
     
  2. pdeeh

    pdeeh Member

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    I would have thought it easier to look at the manufacturer's data and start from there ...
     
  3. John Wiegerink

    John Wiegerink Subscriber

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    I think it might get you an excellent starting point, but I wonder about staining developers and this method. I might compare Pyrocat-HD just to see. Not so much about the stain, but these developers rely on the stain to alter the final brightness range. Just curious and I'm going to try this with some D76 to see if it gets me close to what I already have for a time. If this works I'm writing it on my bathroom stall so I can read it several times a day. JohnW
     
  4. jp498

    jp498 Member

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    Manufacturer's data doesn't work when you're using a third party or non-mass-market developer.

    I haven't had a need to try this. I have a binder in the darkroom with printouts from the massive dev chart for each developer I use. It gets me close.
     
  5. John Wiegerink

    John Wiegerink Subscriber

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    I agree that the MDC is a Godsend sometimes, but it ain't perfect either. At least not for me and Arista EDU/Foma 100 120 film. This method might have saved me a little time and material if it works. JohnW
     
  6. TheToadMen

    TheToadMen Subscriber

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    The original question came up when someone was looking for developing times for WEPHOTA B&W films. The manufacturer didn't provide info and it wasn't on the massive dev charts. Hence the original question about this tip ;-)

    Good point about staining developers, though. I guess this will be different compared to "normal" developers like D76 or Rodinal.
     
  7. pentaxuser

    pentaxuser Subscriber

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    I'll have to try this and see how close it gets me to the times I use for Xtol and my range of films.

    I have used the leader to test for potentially exhausted developer but never tried this test. Just on a point of clarification. My fogged leader before development is usually a greyish colour and when fully immersed goes black after a few minutes. I had never noticed it go through a grey stage and yet as the test involves keeping half out of the developer and matching then it presumably must?


    I'll need to watch more closely in future

    pentaxuser