Tar-like gunk in Fuji Hunt C41 Dev (C)

Discussion in 'Color: Film, Paper, and Chemistry' started by tobias, Sep 14, 2011.

  1. tobias

    tobias Member

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    Hi,
    I've been happily using the Hunt 5L kit for a while now, mixing it up in 300ml batches as I go along. Recently, however, when I have mixed a new batch, the component C of the Dev (which I assume to be the CD-4), has produced a sticky tar-like gunk precipitate, most of which floats to the top and can be whisked off, but I have found it impossible to remove from my measuring beakers.

    Despite the apparent loss of something from my dev, and the cloudy aspect of that which remains, this issue does not appear to be having an adverse effect on my negs. Anyone else seen this problem before?

    Cheers,
    T
     
  2. RPC

    RPC Member

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    So the gunk forms only when you mix the developer, and the part c bottle looks normal before mixing?
     
  3. tobias

    tobias Member

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    yup, and it is not present in the bottle. I measured the C with a syringe, and when i injected it into the other two and water, the gunge formed around the syringe head.
     
  4. hpulley

    hpulley Member

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    Mixing it for 2 minutes doesn't dissolve it? What temperature are you mixing it at?
     
  5. tobias

    tobias Member

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    mixing at 38c, and no, it seems to be insoluble. I have tried both acidic and alkaline, hot and cold to try and clean my beaker.
     
  6. guyjr

    guyjr Member

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    What color is your Part C dev before mixing? If it is dark in color / purplish or even black, then it has gone bad and should probably be replaced.

    I learned this the hard way a few weeks ago with the Rollei kit (which is supposedly assembled using Fuji-Hunt chemistry). I will say that I got decent enough results from the 5L Fuji-Hunt kit even after the Part C had turned dark, but will not attempt that again after I ruined some rolls a few weeks back with a bad Part C from the Rollei kit.
     
  7. tobias

    tobias Member

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    yes, it is purplish black, but I remember it being this colour from the start, and the odd thing is that the dev seems to work regardless. Maybe not ideal for commercial work, but the last batch i processed came out perfectly, as far as I can see.
     
  8. DanielStone

    DanielStone Member

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    can you strain out the black part with a coffee filter, or fine cheesecloth? Heck, even a cotton ball at the bottom of a funnel works in a pinch, or an old silk stocking

    -Dan