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Thread: D76 question

  1. #11

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    Quote Originally Posted by Mick Fagan
    I haven't seen any real difference, visually, in any of the films I've developed in that time, but you never know, eh?
    The thing is that I am going to measure the negatives with a densitometer. I can imagine that in 'practical use' it is barely noticable, but as I want to be 100% sure I'll just wait processing till after the 24hours... so that the densitometer (I use the Heiland Splitgrade for this) doesn't 'see' a difference either.

    Once again many thanks...
    SoulSurround

  2. #12
    Mick Fagan's Avatar
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    SoulSurround, I would be interested in your results, if you have any between the fresh mixed developer and 24 hour wait developer.

    Mick.

  3. #13

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    Quote Originally Posted by Mick Fagan
    SoulSurround, I would be interested in your results, if you have any between the fresh mixed developer and 24 hour wait developer.

    Mick.
    Unfortunately I didn't develop the roll just after mixing the D76. I only had one test-roll so I couldn't compare rolls (the other -identical- one was already developed the day before). But I will keep the test in mind for the next time!

    Best regards,
    SoulSurround

  4. #14
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    I haven;t used D76 in a long time, but when I did I had sometimes to mix it and use it... no difference tha I can recall.

    Mick: you mean like Upton and Upton?
    Mama took my APX away.....

  5. #15

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    Quote Originally Posted by Mick Fagan
    I've been mixing D76 up and using it within about 1 hour for almost 18 years now, maybe I'll bone up on what Mees & Mees & James have to say.

    I have Developing, by Jacobson & Jacobson 1980 edition which I've had for over 20 years now. Perhaps I'll reread some of it to see if I'm missing something.

    I haven't seen any real difference, visually, in any of the films I've developed in that time, but you never know, eh?

    What is it, about these dual named authors in photography?

    Mick.
    Here is another pair of authors (H.C. Carlton and J.I. Crabtree) whose test data consistently show an inrease in D-76 rate of development with time (from mixing - they call this Keeping Time).

    See page 362 and 364 of Modern Photographic Processing by Grant Haist.
    Tom Hoskinson
    ______________________________

    Everything is analog - even digital :D

  6. #16

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    Quote Originally Posted by Tom Hoskinson
    ... whose test data consistently show an inrease
    in D-76 rate of development with time (from mixing -
    they call this Keeping Time).
    From Patrick Dignan's Classic B&W Formulas an
    article by Milan Merhar:

    "Upon storage or use the borax will tend to
    become more hydrolyzed and thus increase the
    ph."

    So he and a few others interested took out the
    borax and substituted 3 and 9.6 grams, S. bisulfite
    and S. carbonate.

    "This formula thus solves the problems we found
    with D-76." ... "Lifetime tests of this solution show
    that up to ... without any variation ...". The
    implication in my mind is that it is upon use
    that ph will rise and not upon storage.
    Do your sources pin that down?

    If ph rise is a problem only on use and reuse,
    use the developer one-shot and skip the borax.
    Then again, if only on storage ph is a problem,
    skip the borax. Another example of a solutions
    make-up being dictated by it's way of usage.

    In short, included borax only if the developer
    is to be reused. Mr. Merhar's substitute though
    be better. Dan

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