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Thread: C 41 processing

  1. #1

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    C 41 processing

    I have returned to C 41 processing. The first two batches of negatives ( 24 total) done in a JOBO were normal. Subsequent batches have pale green cast (prints red on the contacts). Mixed new LORR LU Developer but no improvement. Re-bleached and re-fixed with fresh chemistry but no improvement. A year and half ago I had problem with high contrast due to inadequate bleaching ( assumed the new 400 Portra was exhausting the bleach prematurely).Re-bleaching and re-fixing solved it.
    For years I have been using traditional C 41 developer but wanted to avoid mixing and storing 5 gallons of replenisher. THE LORR LU requires mixing only 1.5 liters. Anyway, that's not the problem.
    What could cause the green tint in the negatives?
    Thanks

  2. #2

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    Contaminated developer is the first thing that comes to mind.
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  3. #3

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    Contamination is a possible but also think of a light leak somewhere. That will give greenish negatives. I know because it happened to me a couple of times when using a defective press on cap on a JOBO tank.

    Once it is there and you had bleached and fixed it, there is nothing that can be done.
    Last edited by BMbikerider; 11-29-2013 at 02:37 PM. Click to view previous post history.

  4. #4
    polyglot's Avatar
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    Any chance you fogged the film with the red LED temperature display on your Jobo?

  5. #5
    David Lyga's Avatar
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    I do not think even the more experienced here are fully aware of how much fog can be caused by a tiny red light. I am talking about a light on a surge protector and even on a manual phone answering machine. It took me a long time to identify this cause and, still, I am dumbfounded with the damage such a tiny light can cause. Color negative film is VERY sensitive to this color. - David Lyga

  6. #6

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    Thank you to all. I have covered the red lights on the JOBO. My suspicion is that I have bleach staining due to exhausted chemistry although I don't use control strips to confirm it. Will try fresh everything later today.



 

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