c41 marks

Discussion in 'Color: Film, Paper, and Chemistry' started by EcZc, Jun 8, 2011.

  1. EcZc

    EcZc Member

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    Hi

    Could anyone tell me what they think is the most likely cause of the marks in the sky on the attached negative? The negatives were developed with a Jobo, fresh chemicals, pre-wash, washes between bleach/fix and fix/stabalizer, correct temperature and great care not to cross contaminate chemicals. Could it be anything to do with having more than one film on a reel at a time? It only seems to affect 120 and 5x4 - 35mm come out great.

    Thoughts appreciated!
     

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    Last edited by a moderator: Jun 8, 2011
  2. epatsellis

    epatsellis Member

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    While I realize that many advocate a prewash and rinse, I have followed the Z131 reccomendations for rotary processing and get nothing but perfect negatives every time.
     
  3. timparkin

    timparkin Member

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    How long pre-wash are you doing? I've had this happen a lot until I started doing a two minute pre-wash (I actually do longer than this out of paranoia) ..

    Could be the warm up too - 35mm probably warms up very quickly.. Just a thought... (I think not but worth mentioning)
     
  4. Sirius Glass

    Sirius Glass Subscriber

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    I used a five minute prewash per the Jobo and Unicolor kit.

    Steve
     
  5. EcZc

    EcZc Member

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    Good point on pre-wash length / film size. I'm using a pre-wash of 3 to 5 mins. I'm not checking the exact temp of the pre-wash water though, I just mixing it reasonably warm - not hot.

    I always rinse reels under clean water, I read recently they should be scrubbed to get rid of stabalizer. Any chance this could be the cause?
     
  6. Sirius Glass

    Sirius Glass Subscriber

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    Part of the reason to prewash is to get the film to the proper temperature.
     
  7. EcZc

    EcZc Member

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    So what temperature should the pre-wash water be? I had consistent good results for over a year and never checked pre-wash temperature, just gave it 3 mins with 8x10, 5x4 and 120. I thought pre-wash got to roughly correct temp but more importantly allowed even absorbsion of the dev.
     
  8. timparkin

    timparkin Member

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    Should be the same temp as the processing...
     
  9. EcZc

    EcZc Member

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    Well yes, obviously I guess, but it still doesnt add up for me as it has never caused issues before.
     
  10. Sirius Glass

    Sirius Glass Subscriber

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    Large differences in temperature can cause reticulation. You may have been lucky.
     
  11. EcZc

    EcZc Member

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    But lucky in over 250 sheets of 5x4 and 100 rolls of 120?