developing amount

Discussion in 'B&W: Film, Paper, Chemistry' started by dpodeath, Feb 24, 2004.

  1. dpodeath

    dpodeath Member

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    My small developing tank says 375cc for one roll of 35mm and i usually make enough chemicals for 400cc.

    Does anyone know if the extra 25cc should have an effect of the development of the film? i also heard some suggestions to add as much as 10 percent time if developing 36 exp films.

    any advice would be appreciated.

    charlie
     
  2. bmac

    bmac Member

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    I wouldn't worry about it.
     
  3. Bruce Osgood

    Bruce Osgood Membership Council Council

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    Any size tank should be filled but not over filled. The air gap in the lid allows the filled tank to drain back and forth during inversions. As far as an extra 10% for 35mm films, I can't see why anybody would say that as a general rule. there are many sources for standard development at temperature you should start with.
     
  4. john_s

    john_s Subscriber

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    If there's enough developer to cover the film safely in a spiral tank there will be enough.

    There are a small number of exceptions, though, for some extremely dilute developers, (for example Rodinal diluted 1+100), and some unstable developers (like PMK) where having more can prevent the problems of developer weakening too much.

    As has been pointed out, the size of the air space in the tank will have a significant effect on the kind of agitation you get. Opinions differ. I think that a large air space is ok as long as you remember that even very gentle inversion will move the liquid much more than in a nearly full tank.