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Thread: C-41 Stain

  1. #1

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    C-41 Stain

    I am processing 4x5 sheets in a Jobo Expert Drum using Kodak C-41 and the minimum chemistry (210ml) for the drum one-shot. Getting stains and streaks that are sometimes visible in the film, sometimes not. The drums are not leaking. (that had been a problem once with E-6) I am using a wash between all of the steps. Using the recommended rotation speed for these drums and temperature. Attached is a section of a film. The stains are in the direction of rotation. I am using a pre-heat and a pre-rinse. i do not think I had the problem on previous batches but since they are not all scanned, it is possible that I missed seeing this. Only have two ideas. One is to increase the speed which I do not think will help. The other is use more chemistry. Hate to do this since Kodak is making this stuff very hard to get and very expensive. As in I had the fixer back ordered for nearly three months with Calumet and when it came the bottles were 5L rather than 10L and 30% more per bottle. Any ideas would be appreciated.

    Chuck
    Attached Thumbnails Attached Thumbnails Stain.jpg  

  2. #2

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    I had a staining issue that appears to have been caused by running the Jobo at the lower rotation speed. Not sure if a higher speed would help.

    For chemicals, have you tried the Rollei Digibase? It seems they are repackaged Fuji-Hunt C41 chemicals.

  3. #3
    Terry Christian's Avatar
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    C-41 Stain

    I don't have a JOBO, but is it possible to remove the drum periodically and give it a bit of random manual agitation during development? That might help to avoid rotation marks.

  4. #4

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    Quote Originally Posted by Terry Christian View Post
    I don't have a JOBO, but is it possible to remove the drum periodically and give it a bit of random manual agitation during development? That might help to avoid rotation marks.
    Possible? Yes, but probably not advisable. From what I could tell on the net, some of the Jobo machines had rotation speed options that are just a little too slow. However, all of their machines have at least one speed option that is sufficient to avoid streaks/stains.

  5. #5
    Rudeofus's Avatar
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    I had similar stains with C41 processing (hand tank, not rotary) and these went away for good when I began to use a stop bath and a wash between CD and BLIX/bleach. Be careful which kind of stop bath you use, PhotoEngineer has on a few occasions advised against citric acid which is used in most commercial B&W stop bathes.
    Trying to be the best of whatever I am, even if what I am is no good.

  6. #6
    Photo Engineer's Avatar
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    This almost looks like a shadow not a stain.

    However, if it is truly a stain, make sure you use a prewet and use a stop after the developer.

    PE

  7. #7

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    Quote Originally Posted by Photo Engineer View Post
    This almost looks like a shadow not a stain.

    However, if it is truly a stain, make sure you use a prewet and use a stop after the developer.

    PE
    What serves as a stop? Will a 1.5 minute wash with water suffice?

  8. #8
    Photo Engineer's Avatar
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    Use 1 - 2 % Acetic Acid.

    PE

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    Quote Originally Posted by Photo Engineer View Post
    Use 1 - 2 % Acetic Acid.

    PE
    Thanks. I just ran a roll through in which I used a stop bath between the developer and bleach stages. I will post a scan later today or tomorrow.

  10. #10

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    Quote Originally Posted by tnabbott View Post
    Thanks. I just ran a roll through in which I used a stop bath between the developer and bleach stages. I will post a scan later today or tomorrow.
    Wow! What a revelation. The stop bath makes a huge difference. See attached (not art, but was available):
    Attached Thumbnails Attached Thumbnails Coffee Beans in Dirty Canister.jpg  

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