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Thread: c41 marks

  1. #1

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    c41 marks

    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!
    Attached Thumbnails Attached Thumbnails c41-marks.jpg  
    Last edited by EcZc; 06-08-2011 at 11:56 AM. Click to view previous post history.

  2. #2

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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. #3

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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. #4
    Sirius Glass's Avatar
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    I used a five minute prewash per the Jobo and Unicolor kit.

    Steve
    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

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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. #6
    Sirius Glass's Avatar
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    Part of the reason to prewash is to get the film to the proper temperature.
    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

  7. #7

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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. #8

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    Should be the same temp as the processing...

  9. #9

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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. #10
    Sirius Glass's Avatar
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    Quote Originally Posted by EcZc View Post
    Well yes, obviously I guess, but it still doesn't add up for me as it has never caused issues before.
    Large differences in temperature can cause reticulation. You may have been lucky.
    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

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