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Thread: "contamination" between b/w and C41 chemistry?

  1. #1

    Join Date
    Nov 2017
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    "contamination" between b/w and C41 chemistry?

    Right now I've only done b/w development. But I do have quite a lot of color negative film around so I thought I'd try C41 development. But I've read so much about keeping all those chemicals separated etc that I'm a bit scared of starting.

    - I got a separate set of beakers for my CPE2 so I do not have to use the b/w ones for C41
    - likewise I got separate storage bottles

    BUT:
    - do I keep the tanks also separated?
    - somewhere I read that you should not use the stabiliser in the same tank you develop in. But the film is on the reel, I don't see myself swapping reels with wet film. Or am I getting to paranoid?
    - can I mix the chemicals in the same (plastic) measuring beakers or should I get different ones as well?

    Any other things I need to take care of before starting?
    Expert in non-working solutions.

  2. #2

    Join Date
    Jun 2014
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    1,694

    Re: "contamination" between b/w and C41 chemistry?

    I use the same equipment for any process and any kind of solution, so no dedicated tanks or beakers for color/B&W, dev, fix etc. etc. I just rinse everything immediately after use. No problems at all.

  3. #3
    Corran's Avatar
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    Apr 2011
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    Re: "contamination" between b/w and C41 chemistry?

    Same. Just rinse everything, which should be your SOP anyway.
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    All comments and thoughtful critique welcome

  4. #4

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    Mar 2007
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    Re: "contamination" between b/w and C41 chemistry?

    With regard to the stabiliser bath at the end of C41, I always used either a dedicated jug or tray, depending upon whether it was roll film or sheet film. This is the only thing in film developing that I have ever kept as a dedicated unit. Washing a stabiliser bath dish/tray, or jug, takes quite a while to eradicate the surfactant in the solution, so only for that bath have I ever used a dedicated container.

    Everything else is just washed, then re-used for whatever process is next.

    If you have sheet film on reels, remove each sheet separately and run each individual sheet through the stabiliser bath. I do this by hand; wear gloves. For roll film, I separate the reel and quickly turn the half reel with the film on, then drop it into the stabiliser bath.

    Mick.

  5. #5

    Join Date
    Nov 2017
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    Re: "contamination" between b/w and C41 chemistry?

    Ok, so I'm overthinking it. "Paralysis by analysis" as it is sometimes said on this forum.

    But if I can keep the stabiliser in a separate container it will save time cleaning and washing up. Which I don't like. As I do have more tanks than I really need that is an option.

    Thanks guys.
    Expert in non-working solutions.

  6. #6

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    Aug 2000
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    California
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    Re: "contamination" between b/w and C41 chemistry?

    Cleaning and washing up is a necessary task in the darkroom if you want to maintain consistent results.

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