Will over-developing UNexposed film produce clear or dark negatives?

Discussion in 'Photography' started by t.mclean, Jan 10, 2004.

  1. t.mclean

    t.mclean Guest

    The subject says it all. Will over-developing UNexposed film produce clear
    or dark negatives?

    Reason I ask is that my new automatic film processor is producing what looks
    like over-developed negatives. As a trial, I ran some UNexposed film and the
    negatives came out dark. I am now trying to figure out if my whole batch of
    film is fogged or if my processor is over-developing the films.

    Does it matter how long you process UNexposed film? Should it come out clear
    no matter how long it sits in the developing solution? I'm thinking it
    doesn't matter and that the dark negatives are likely due to a bad batch of
    film that has been fogged somehow.

    Any help appreciated!

    t.mclean, Jan 10, 2004
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  2. t.mclean

    Dave Guest

    Truly unexposed film will remain clear no mater how long is sits in the
    developer. No exposure = nothing to develop.
    Dave, Jan 10, 2004
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  3. t.mclean

    t.mclean Guest

    Thanks for your response. I am thinking that this batch of film has been
    fogged in some way during manufacturing or shipment. At first I thought I
    had a light leak in the dark room, but I haven't changed anything there at
    all and previous films were never dark/fogged.

    I guess the next step is to run some unexposed film from a different brand
    and see if I get the same results. If I do, then however unlikely, I've got
    a light leak or some other factor that is fogging my film in the dark room.
    (Yes, I'm using the correct safelight)

    t.mclean, Jan 10, 2004
  4. Film has a black antihalation backing that is supposed to come off during
    development. Perhaps it isn't coming off in your developer for some reason.
    Marvin Margoshes, Jan 10, 2004
  5. t.mclean

    brian Guest

    It sounds like a developer problem, how old is the developer your using?, or
    how many films have you developed in that particular solution?, maybe even
    the stop bath or fixer are wasted, try making up a fresh batch of all 3,
    from new containers. Unless the film you have is years and years out of date
    it shouldn't go off by that much, people have sucessfully developed film
    found inside camera's after many years, I heard a story about a guy who was
    given his grandfathers camera I think it was only about 5 years ago, and
    found a film inside it, out of curiosity he had it developed, his
    grandfather had taken the photos in 1936 while on holiday in germany and it
    actually had clear photos of Adolf Hitler at a rally.

    brian, Jan 10, 2004
  6. t.mclean

    t.mclean Guest

    Thanks for the replies. The chemistry for all the solutions was brand new,
    never been used before. I had suspected a chemistry problem earlier, so
    dumped it all and refilled from new, unopened bottles. That's why I started
    running unexposed film through the machine to see if the film was somehow
    fogged, but wasn't sure if unfogged film would come out clear even if over
    developed time/temp wise.

    Thanks again

    t.mclean, Jan 11, 2004
  7. t.mclean

    Harry Guest

    I don't know, but maybe your safelight is no good with modern emulsions.
    You might want to try processing in absolute darkness just for a test.

    Good luck!
    Harry, Jan 12, 2004
  8. You could do an extra test, with a different film (bought
    from a different store, with expiration date as far as
    possible in the future, etc.) and see what happens.

    Carlos Moreno, Jan 12, 2004
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