Diafine - Substitute Formula

Discussion in 'B&W: Film, Paper, Chemistry' started by dancqu, Jan 16, 2005.

  1. dancqu

    dancqu Member

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    This formula is from Patrick Dignan's book Classic B&W Formulas.

    Solution A
    Sodium Sulfite, 35 grams - Hydroquinone, 6 grams
    Phenidone, 0.2 grams - Sodium Bisulfite, 6 grams
    Water to make, 1 liter

    Solution B
    Sodium Sulfite, 65 grams - Sodium Metaborate, 20 grams
    Or, Borax 20 grams, for results "like that of D76"
    Water to make, 1 liter

    Mr. R. W. Anderson who wrote the article, claims a true
    one stop speed boost plus "the advantages ... of
    a two bath".

    Have any experience with Diafine or the Homebrew
    version? Is it realy as long lived as some say? Dan
     
  2. Tom Hoskinson

    Tom Hoskinson Member

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    Yes, this recipe works fine and has a good shelf life. This recipe has been posted several times before on APUG.
     
  3. dancqu

    dancqu Member

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    Three chemicals with regenerative properties and, I'd think, a
    somewhat high ph, account for it's short processing time. Also
    the amount of phenidone, even at a 1:9 dilution, is higher
    than some.

    I've read that today's thin emulsion films are not candidates
    for a Diafine like two-bath type of processing. Diafine though is
    not the only A-B developer on the market. I wonder if there really
    are any film/A-B mismatches?
     
  4. Dean Williams

    Dean Williams Member

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    I haven't used Diafine with a lot of different films, but have had good results with the films I've tried in it. Speed wise, it makes Tri-X go fast, though not the 1600 that Diafine claims, IMO.
    There are a couple of films that actually loose speed in Diafine, according to the makers.
    I'd say the keeping qualities are amazing for a solution that is mixed from a powder, used and poured back into the bottles over and over again, and stored for indeterminate weeks before being used again. My current batch is over a year and a half old, and shows no sign of weakness.
     
  5. gainer

    gainer Subscriber

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    I wonder if some claims of speed enhancement are not the result of times when the ASA spec was used. It had a considerably higher safety factor for metering than the ISO. Acufine and Diafine first came out when we still had ASA on the box. Nowadays, we see numerous photographers who set their meters a stop or so slower for best shadows. Just a thought.
     
  6. dancqu

    dancqu Member

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    Plus X and Tri X were 125 and 400 ASA and are now the same
    ISO. It is my understanding that the International standard and
    the USA's ASA are equivalent. Perhaps you are thinking of the
    earlier Weston standard. Dan
     
  7. fhovie

    fhovie Subscriber

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    I mixed the above formula and it gave me a lot of fog - it was really a flop - I would reconsider usining it but wonder if I should add some benzotriazole.
     
  8. Paul Howell

    Paul Howell Member

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    I have used Dinafine over the years, and just assumed that a thick emlusion soaked up more part A than newer thin emlusions so you cannot push TAX 400 as much as you can Tri X.

    Regards

    Paul
     
  9. dancqu

    dancqu Member

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    I put a couple of rolls through Diafine a few years ago and
    did not like the fog levels it gave and it's turning brown.

    The less vigorous borax version, or even a bicarbonate version,
    may clear everything up and give near same results. Dan
     
  10. jon.oman

    jon.oman Member

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    An interesting / old thread.

    Another thing to try......