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  1. #1

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    Diafine revisited: Ascorbate version

    I was made some experiment with Diafine formula and replace 6g of Hydroquinone in bath A to 10g of Sodium Ascorbate. so my formula of Diafine-C:

    Bath A
    Sodium sulfite 65g
    Phenidone 0,2g
    Sodium Ascorbate 10g
    Sodium metabisulfite 5g
    Water 1l

    Bath B
    Borax 10g
    Sodium sulfite 65g
    Water 1l

    usage 3min in each bath. results is very good - really less grain
    HP5+ @400, scan 2400dpi, left Diafine-C, right - Diafine

  2. #2

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    great results.

    does it give the speed increase with the borax?
    what are the keeping properties of bath A?

  3. #3

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    Phenidone at 0.01g/L is a slow developer.Can you verify that you are not just getting development in bath B due to carry over of bath A on the film surface,tank and reel rather than due to developer absorbed in the emulsion?

  4. #4

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    Quote Originally Posted by el wacho View Post
    great results.
    does it give the speed increase with the borax?
    what are the keeping properties of bath A?
    yes, compare to original PQ version ascorbate produce more dense negatives. I can't talk about speed because when we rate film as more speed we have more grain
    keeping properties of bath A is very good because low pH.
    formula for Diafine I found in Steve Anchell "The Darkroom Cookbook"

  5. #5

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    Quote Originally Posted by Alan Johnson View Post
    Phenidone at 0.01g/L is a slow developer.Can you verify that you are not just getting development in bath B due to carry over of bath A on the film surface,tank and reel rather than due to developer absorbed in the emulsion?
    Phenidone is 0.2g/l, not 0.01g/l ))

  6. #6

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    I mean that due to carry over on the film surface,tank and reel the phenidone concentration in bath B may be such as to produce the image,it may not be due to phenidone absorbed in the emulsion and therefore not true 2-bath development.
    Just pour 20ml bath A into 500ml bath B and see if this will develop the film,if so it is not 2-bath development.

  7. #7

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    Quote Originally Posted by Alan Johnson View Post
    I mean that due to carry over on the film surface,tank and reel the phenidone concentration in bath B may be such as to produce the image,it may not be due to phenidone absorbed in the emulsion and therefore not true 2-bath development.
    Just pour 20ml bath A into 500ml bath B and see if this will develop the film,if so it is not 2-bath development.
    Alan, my experiments with 2 bath developers not confirm this. I was try more than 10 different 2 bath developers and 2nd bath isn't one-shot (sometime I make fresh solution). always I get same result from each developer.
    3min in 2nd bath is very small time and developing going only in film surface

  8. #8

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    some interesting fact:
    20ml of any stock (D76, D23 or other) + 1g Sodium carbonate + 300ml of water require 20-25min for developing HP5@400. compare this time with 3min in borax alkali (as bath B).
    if you add 20ml of bath A into bath B and put film to bath B (skip bath A) for 3min - you have blank negatives - trust me ))

  9. #9

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    Well you are claiming to have made the first ever successful phenidone ascorbate 2-bath developer.
    A serious scientific claim requires more evidence than "trust me" IMO.

  10. #10

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    I'm not a "scientific". you can simply try this formula instead posting abstract theory here ))

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