D76H - Stock or 1:1 ?

Discussion in 'B&W: Film, Paper, Chemistry' started by Stew, Sep 18, 2008.

  1. Stew

    Stew Member

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    Hi everyone,

    Lately I've been making D76H from raw chemicals and have been using the stock solution for my films. The results have been very good, but am I missing out on sharpness and tonality by not using it at the 1:1 ratio? If so, is the difference that great?

    If it matters I'm using Agfa APX100.

    Thanks.:smile:
     
  2. fschifano

    fschifano Member

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    Not so much that you'd notice with modest enlargements. After that you might, and it becomes a choice of more sharply defined and noticeable grain over less. Only you can make that call, 'cause only you know what looks good to you.
     
  3. Photo Engineer

    Photo Engineer Subscriber

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    Kodak's internal standard for all measurments of B&W products was D-76 stock. That is the recommended standard.

    PE
     
  4. dancqu

    dancqu Member

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    D76H, minus that pinch of borax a D-23 with 33% of
    the metol but 100% of the sulfite. For capacity it is
    likely the most sulfite loaded of ANY developer. Is it
    used one-shot? Dan
     
  5. Bruce Osgood

    Bruce Osgood Membership Council Council

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    I've been using the D-76H formula found in the APUG files 1+1 with the times and temperatures Kodak offers for their D-76. I use the dilute one shot in a Jobo. The stock solution seems to keep a long time.

    Distilled Water 750 mL
    Metol 2.50 g
    Sodium Sulfite 100.00 g
    Borax 2.00 g
    Tap water to 1000 mL

    I wouldn't change a thing.
     
  6. PhotoJim

    PhotoJim Member

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    Try it. That's the best answer.

    You will get better sharpness and acutance (and higher grain; they go together). Whether it's a good tradeoff is up to you.

    Shoot a roll on some subjects, and shoot an identical roll. Develop each, one stock, one 1:1, and see.
     
  7. dancqu

    dancqu Member

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    Keeps a long time? I'd guess so as it is not much
    more than a bottle of sodium sulfite solution.

    A variation might be 7.5 grams metol + 100 grams
    of sodium sulfite + perhaps 6 grams of borax.
    A low sulfite D-76H.

    Skip the borax. Make that 8 grams of metol and
    80 grams of sodium sulfite and you've my formula
    D-23. I use it 1:7, 500m, each 120 roll. Dan
     
  8. 23mjm

    23mjm Member

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    I prefer 1:1 it has longer development times----helps make my development more constant. Small time differences in processing are less of a % of the total time if it's a longer development time. It may not make much difference but makes me feel better plus the soup goes further!!!
     
  9. Uncle Bill

    Uncle Bill Subscriber

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    I am a fan of the 1+1 ratio and I don't mind the slight increase in grain.
     
  10. dancqu

    dancqu Member

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    I'm Reminded

    That above should read '500ml'. Minor matter
    but I am reminded: What are the solution volumes
    used. Some use this dilution, some that, but many
    never bother to mention the amount. The amount
    may vary considerabley; as little as 250ml for
    35mm or even less with rotary and up to a
    litter for stand development. Dan
     
  11. Igor Savchenko

    Igor Savchenko Member

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    Dan,

    Please, why are you back to D-23 (your version of it) after using so many other developers?
    _______
    Igor
     
  12. dancqu

    dancqu Member

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    I'm a minimalist to start, so metol plus sodium sulfite. I like
    the look of the negatives, good gradation and compensation,
    from a one bath developer. D-23 or my close clone, 8-80 grams,
    at a 1:7 dilution is slow working; Acros-16 minutes with
    3 inversions every other minute.

    A few days at most prior to processing I compound it
    1-10 grams metol-sulfite, then split to two small
    bottles. Each 120 roll, 500ml. Dan
     
  13. Igor Savchenko

    Igor Savchenko Member

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    Thanks, Dan.
     
  14. psvensson

    psvensson Member

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    D-76H has rather poor storage characteristics, according to this study: http://www.udmercy.edu/crna/agm/phenvitc.htm. It's probably because it lacks the "self-replenishing" effect of hydroquinone reacting with the base.