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  1. #11

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    The only trouble I ever had was the highlights lacked separation. I used an old Leica formula similar to d23 with plus x and tri x.

    Emulsion batches since 1985 or so seem not to hold enough part a so increase the developer concentration.

    They work well for normal contrast subjects too.

  2. #12
    skahde's Avatar
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    Quote Originally Posted by jdef
    Would the emulsion absorb the alcohol solution in the first bath?
    No. You need some swelling of the gelatine-matrix to "open" it and let the chemicals in.

  3. #13

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    Quote Originally Posted by skahde
    No. You need some swelling of the gelatine-matrix to "open" it and let the chemicals in.

    And for this you'd need an alkaline solution???

  4. #14
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    Quote Originally Posted by jim appleyard
    And for this you'd need an alkaline solution???
    Water in the first place. As Alcohol attracts water stronger than gelatine does, putting gelatine into alcohol means to remove water from it.

    Putting chemicals dissolved in alcohol on an emulsion is like throwing a handfull of rice on a dry sheet of glass.

  5. #15
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    Jay, this link may be worth reading: http://www.largeformatphotography.info/twobath/

    BTW.: Leaving out bath B altogether is another interesting step in the process of optimizations. I tried it and I am not kidding.

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