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  1. #21

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    a PQ developer will give you more speed...

  2. #22
    Harry Lime's Avatar
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    Quote Originally Posted by el wacho View Post
    a PQ developer will give you more speed...
    Something like PD-76?

    http://www.jackspcs.com/dd76v.htm


    What does PQ stand for?

    thanks

  3. #23

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    PQ: Phenidone Hydroquinone.

  4. #24
    Harry Lime's Avatar
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    Quote Originally Posted by Anon Ymous View Post
    PQ: Phenidone Hydroquinone.
    thanks

  5. #25

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    Quote Originally Posted by Harry Lime View Post
    Something like PD-76?

    http://www.jackspcs.com/dd76v.htm
    ......
    thanks
    Are the dev times for the last two formulas a misprint? Interesting formulas, but 22 minutes in bath A and 24 minutes in bath B looks crazy.

  6. #26
    Harry Lime's Avatar
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    Are you looking at the AP and XAP versions? Yes, that does seem odd...

    I think I'm going to mix up a batch of PD-76. I've been using Bary Thornton's 2-bath for the past few years, but if PD-76 gives me a speed boot I may switch over.

  7. #27

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    Harry,
    if you liked Thornton's with 80g of sodium sulfite/a litre then you'll love fx4 as a two bath. the same granularity plus the speed boost. i notched the SS down to 80g in fx4 and got similar results. be careful with your times for B bath. start at 2 min and increment by 30sec as the highlights can blow out ( for condenser - might be perfect for diffusion though) all the best.

  8. #28
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    Two bath developers

    I've noticed some loss in speed as well, but a full stop sounds like too much. Could be problem be that your home-brew isn't as strong as the store bought chemicals you're comparing to? For instance, if your using grocery store soda instead of soda from a photo-chemical supplier, your B bath my not have the right ph. Try increasing the amount.

  9. #29
    Harry Lime's Avatar
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    Quote Originally Posted by el wacho View Post
    Harry,
    if you liked Thornton's with 80g of sodium sulfite/a litre then you'll love fx4 as a two bath. the same granularity plus the speed boost. i notched the SS down to 80g in fx4 and got similar results. be careful with your times for B bath. start at 2 min and increment by 30sec as the highlights can blow out ( for condenser - might be perfect for diffusion though) all the best.
    Crawley fx4?

    Do you have a formula?

    thanks

  10. #30

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    Two Bath - A Way to Compensate

    Quote Originally Posted by Harry Lime View Post
    Crawley fx4? Do you have a formula? thanks
    FX-4: Metol - Phenidone - Hydroquinone,
    1.5 - 0.25 - 5 grams --- sodium sulfite - borax -
    potassium bromide, 100 - 2.5 - 1 grams. Water
    to make 1.0 liter.

    A full fledged two bath does no or very little developing
    in the the first bath. As more development takes place
    in the first bath the second bath plays less and less
    of a roll.

    As a two bath some may wish to use water as a
    second bath. With multiple passes high levels
    of compensation are possible. Developer
    depletion, and in the case of Metol,
    bromide inhibited development
    are the mechanism.

    Little exposed areas of the film are developed fully
    while the dense areas are held back. Similar results
    can be had using very dilute single bath developers
    and infrequent agitation; eg, FX-1 and Beutler's.
    D-23 at a 1:7 dilution works well. With it I've
    had good results and near full speed. Dan

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