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  1. #1

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    Mottling (low density patches) on negative

    I've not seen this problem before, it is distinct from the phenomena encountered using plastic reels and tanks but presumably has to do with the interaction of developer and film. - film processed in stainless steel tank and reel. Another film processed at the same time featuring extensive sky does not show these marks, which I've double checked on a light box.

    Any ideas?

    See area at top of image below:


  2. #2
    Bill Burk's Avatar
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    I haven't seen it before, but are you using powdered developer or mixing your own? Has it fully dissolved (any chance there are clumps of chemistry)? Is there a chance the developer sat around long enough to begin crystallizing? Filtering the developer will help if any of these guesses are right.

  3. #3

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    Hello Bill,

    Good point I was using slightly old XTOL. I'll mix up a fresh batch with distilled water before processing any more important film.

    Tom

  4. #4
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    Tom;

    I see a series of dark arks across the top starting at the middle and moving to the left. This is in addition to the fault you note which on my screen is less evident than the arks.

    It indicates to me that there is some sort of agitation or foaming problem.

    PE

  5. #5

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    PE,

    I was using a 4 reel tank, perhaps I should stick to the 2 reel tanks with plastic lids from Calumet which have never given problems. The film does seem to slide around more in the longer tank.

    EDIT: the 4 reel tanks are all metal and leak slightly, compared to the plastic lid tanks which form a good seal.

    Tom

  6. #6
    Photo Engineer's Avatar
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    Well, if I were Noah, I would see arks, but I saw arcs!

    Sorry about the misuse!

    Anyhow Tom, I have no idea, I just saw a lot of non-uniformity with no specific cause.

    PE

  7. #7

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    Quote Originally Posted by Photo Engineer View Post
    Anyhow Tom, I have no idea, I just saw a lot of non-uniformity with no specific cause.

    PE
    Yes, it is a puzzling one. I think I'll stick to the 2 reel tanks for the moment and double check my assumptions...
    I switched from plastic to stainless steel a while back and in general have achieved better uniformity, certainly none of those edge markings that can appear with plastic reels.

    Tom

  8. #8
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    Did you use a pre-wet?

    PE

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    Yes, despite what ILFORD suggests.

    Tom

  10. #10

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    Not sure what specific type of stainless steel tank you used, but did you drop the reels into the tank already full and begin agitation right away, or did you fill the tank through the daylight lid with the reels already in?

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