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Thread: Sheet film uneven edge density

  1. #1

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    Sheet film uneven edge density

    My film is drying in a way that leaves almost a border in an "L" shape along one long and one short side. It is an "L" shaped area of less density on the negative that only shows up on occasion. It is located always on the notch code edge and side closest to the notch code. I hang my film from the notch code corner. I use a jobo 3010 expert drum to process my film with the notch code oriented at the upper left. I put my film in the holder with the notch code in the lower left, thus rise and bellows sag are ruled out I feel. Could film drying unevenly leave an area I have described? Thank you all in advance for any answers.

  2. #2
    Format Omnivore Brian C. Miller's Avatar
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    Re: Sheet film uneven edge density

    That sounds quite peculiar. Can you verify that your film is really density as it is drying? You should be able to simply look at the area while the film is wet and during its drying. (This has never happened to me, though)

    This sounds like not enough light is reaching the area in question when the film is being exposed. I don't think that either the development or the drying is affecting the density loss.

    Do you have a scan of this?

  3. #3

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    Re: Sheet film uneven edge density

    The reason I am even considering it having something to do with drying is the shape looks exactly the way moisture looks while traveling away from the corner from where the film is hung. I will post a scan tomorrow hopefully.

  4. #4
    Louie Powell's Avatar
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    Re: Sheet film uneven edge density

    I would not suspect a linkage between drying and density.

    You should hang your film by a corner. That will help water drip off the film as it dries.

    As far as a band of uneven density - how are you processing your film? Uneven density makes me think that there's a development problem, and perhaps the edge of the film is not fully immersed in the developer. This can happen in open trays if the tray is not level. If you are doing multiple sheets in a tray, it is possible for sheets to stick together in a way that fresh developer can't get to the edge of a sheet. Or if you are using some kind of tank, it could mean that you don't have enough solution in the tank.

  5. #5

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    Re: Sheet film uneven edge density

    You said that you put the film in the Jobo drum with the notch code in the upper left?? Does that mean that your film emulsion is facing the side of the drum? The film should be facing away from the side, i.e., to the inside of the chamber. Once the film is properly fixed and washed it should not lighten.

    Mike

  6. #6

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    Re: Sheet film uneven edge density

    Yes, I am hanging my film the corner. Yes, I am placing the film emulsion side in inside the Jobo. I use speed setting 4, fill the tank up with 1200ml of Developer also.

  7. #7

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    Re: Sheet film uneven edge density

    I have cropped in and adjust the levels as such to make the difference in density more apparent.

  8. #8

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    Re: Sheet film uneven edge density

    Dear Jordan;
    That is most definitely a processing error, most likely in the developer. A properly washed negative that has been thoroughly developed and fixed will not show density differences due to any form of drying that I am aware of, short of incineration.
    Denise Libby
    Last edited by archer; 4-Sep-2010 at 23:25. Reason: punctuation

  9. #9

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    Re: Sheet film uneven edge density

    That looks like it received light or some kind of radiation very briefly with a curved object that masked it partially.
    Sergio

    My website

  10. #10

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    Re: Sheet film uneven edge density

    It's less density in the negative, which causes it to be darker in the positive. It happens in the same spot on various negatives. I Process in a Jobo expert drum with all emulsions facing inward towards the core.
    I use 1oz of HC110 concentrate to 89oz of water. Of that I can only use 1200ml of my mixed up developer in my Jobo processor before it begins to leak out. I process for 8 minutes after rating my film at 200. It is a mixture I came up with and it makes negatives that print beautifully, if it weren't for that occasional line of different density.

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