Request for arcane info on B&W film process

Discussion in 'Photography' started by Jaybird, Aug 26, 2012.

  1. Jaybird

    Jaybird Guest

    This is my first post on this group, and searching google isn't
    working too well...

    Back in 1975 I worked for a photo developing/printing firm that
    handled accounts from the Rocky Mountain region. I worked in the
    darkrooms for B&W developing and for the C-22 and C-41 processes,
    operating the huge Pako Pak machines. I made prints as well. I learned
    how much I enjoyed B&W photography from this experience. I also mixed
    the chemicals for all three processes.

    The B&W process was for the 120 and 620 film types, but there was many
    other film types I cannot recall.

    C-22 was the 126 size film, mostly.

    The C-41 process was pretty new, for the 110 film that was growing
    more and more popular.

    Ok, I'm rambling.

    Anyway, I never learned if the B&W process had a "number", like "C-22"
    and "C-41" did.

    Does anybody now?

    Jaybird, Aug 26, 2012
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  2. Jaybird

    Noons Guest

    Jaybird wrote,on my timestamp of 26/08/2012 4:44 PM:
    I don't think B&W had a specific process number. But you can go to
    and ask in the forums there: there are quite a few ex-Kodak labs guys around and
    what they don't know of film photography and its development and processes,
    hasn't been written yet.
    Noons, Aug 26, 2012
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  3. Jaybird

    dadiOH Guest

    Standard B&W used any of numerous reducing (developing) agents and numerous
    blends among those. There were no numbers save some used for specific
    blends...metol, metol/hydroquinone, metol/sulfite, phenidone, pyro, DK-50,
    D-76, DK-60a, ID-11, HC-110, etc. All used a pretty much standard fixing
    agent, sodium or ammonium thiosulfate ("hypo") to dissolve unused silver
    salts and harden the emulsion.

    However, if you were using Pako equipment, Pako may well have given a
    number/name to a proprietary blend for their dip & dunk processors.

    The film sizes...120, 620, 110, 127, 35mm, 4x5, 8x10, etc. had no bearing on
    what chemicals were used in processing. BTW, 620 & 120 are exactly the same
    except for the diameter of the film spool; 127 & 35mm are the same except
    127 has no sprocket holes..

    And, B&W film could also be processed in C-41 color chemicals; not standard
    B&W but those films specifically made for C-41. Kodak Portra was one such,
    there were others.

    Finally, color negative film could be used to make B&W prints; those prints
    were quite good if panchromatic paper was used, not so hot if not.



    Winters getting colder? Tired of the rat race?
    Maybe just ready for a change? Check it out...
    dadiOH, Aug 26, 2012
  4. Jaybird

    Michael Guest

    I beg to differ. 127 and 35mm are most certainly NOT the same size. It
    was 828 that is the same size (unsprocketed) as 35mm. 127 is 4x4 cm and
    bigger in all dimensions than 35mm.
    Michael, Aug 28, 2012
  5. Jaybird

    dadiOH Guest

    Right. Too many numbers :(



    Winters getting colder? Tired of the rat race?
    Maybe just ready for a change? Check it out...
    dadiOH, Aug 28, 2012
  6. Jaybird

    JeffWorsnop Guest

    C41 etc are processes and use different developers made by various manufacturers. C41 process can be used for specific B/W films made for developingby C41 process.
    Traditional B/W didn't have process numbers but there are numerous developers some known by a alpha numeric name eg Kodak D76 and others by name only eg Ilford Perceptol. One feature of traditional B/W processing is that there are thousands of variations in the processes eg dilution, temp., agitation, time and this is a fruitful source for discussion much enjoyed by devotees of traditional B/W photography. C41 is standard time, temp., dilution and agitation.
    JeffWorsnop, Aug 30, 2012
  7. Jaybird

    Jaybird Guest

    Thank you to everyone who posted.

    Jaybird, Sep 9, 2012
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