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Thread: DS-12 stock?

  1. #11
    skahde's Avatar
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    Martin,

    herzlichen Dank! This will save me a lot testing as I intended to try APX with DS-10 as well.

    Viele Gre

    Stefan

  2. #12

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    Quote Originally Posted by skahde
    Martin,

    herzlichen Dank! This will save me a lot testing as I intended to try APX with DS-10 as well.

    Viele Gre

    Stefan
    Film tested by me that gave excellent results with DS-10 are the Deltas, Acros, 400TX and 3200TX. I only made sensitometric tests with FP4+, but these look good, too. APX100, Efke 100 and Lucky 100 and 400 didn't work well.

    I'm looking for a fine grain developer for the APX. I just made a test batch of "Mycrodol" (5g Metol, 100g Sodiumsulfite, 33g Sodiumchloride, 1g Boric acid per liter) and initial results look very promising.

    Martin

  3. #13

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    Quote Originally Posted by dancqu
    I never weigh less than a gram of anything on my .01gr Acculab.
    I would make a fivefold stock useing one gram metol. That will
    leave you with 1/2 liter. That would do me five rolls of 120 at
    1/2 liter/roll.

    I seem to recall that sulfite is not all that soluable. I've doubts 50gr
    of it will fit into 1/4 liter. Never raise the temperature to dissolve unless
    you know that the amount dissolved will remain in solution after it has
    cooled and perhaps cooled for some time.

    BTW, have you any idea why the triethanolamine? Also what is the
    DS-2 he speaks of and do you know where the formula might be?

    DS-12 is likely very similar to FX-1. If so it will also make a good paper
    developer. Dan
    DS-2 is as follows:

    metol 0.4g
    ascorbic acid 1.0g
    sodium carbonate 4.0g
    sodium bicarbonate 1.0g
    sodium sulfite 20g
    water to make 1.0 liter (target pH = 9.8)

    I would mix this immediately before use. It keeps reasonably as a 5x concentrate but for that purpose DS-12 is much better.

    For DS-12, you can make concentrate and it'll keep for some months.

    The reason why I started using salicylic acid and triethanolamine a few years ago is described in archive of old pure-silver list. They are an attempt to solve the problem reported about ascorbate developers, most frequently XTOL, such as sudden failure problems.

  4. #14

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    Quote Originally Posted by Tom Hoskinson
    Dan, take a look in the Chemistry Recipes section. I have mixed up concentrated TEA (as the solvent) versions of Suzuki's DS-14 (Phenidone/Ascorbic Acid) and DS-15 (Metol/Ascorbic Acid). They are paper developers, but at high dilutions they should be pretty close to Xtol (or Gainer's PC-TEA). I am in the process of testing them.
    DS-14, 15 and XTOL are very different developers even if you dilute them. The target pH, bromide concentration, salt concentration, etc. are very different.

    I don't know about PC-TEA, which is not pH buffered. But none of these DS- developers is similar to PC-TEA. Nor is XTOL similar to PC-TEA.

  5. #15

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    Quote Originally Posted by skahde
    I'm about to try Ryuji Suzuki's formula for DS12 (http://silvergrain.org/Photo-Tech/fi...recommend.html). Unfortunately he does not give a recommendation for stock solutions of DS-12. Weighing in such small amounts to make one-shot solutions evere time I need them sounds a bit inconvenient.

    What do you think? Does it sound reasonable to make up a tenfold concentrated stock or would this be overdoing it? Should I stick with fivefold? Any additional precautions?
    Sorry for resurrecting an old thread, but I've recently tried DS-12 and so far it seems pretty good. I was wondering if there's any news to report from attempts to make a more concentrated DS-12 stock.

  6. #16

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    Quote Originally Posted by srs5694
    Sorry for resurrecting an old thread, but I've recently tried DS-12 and so far it seems pretty good. I was wondering if there's any news to report from attempts to make a more concentrated DS-12 stock.
    Here are 3 concentrated Ascorbic Acid developers that work quite well. The same procedure should work for making a concentrated, long shelf life stock solution of DS-12. Just mix the appropriate amounts of sulfite and any additional alkali into the working solution water and then add the concentrate.

    Metol/Ascorbic Acid/TEA concentrated film developer
    http://www.apug.org/forums/article.php?a=41

    Phenidone/Ascorbic Acid/TEA concentrated paper developer and Metol/Ascorbic Acid/TEA concentrated paper developer

    http://www.apug.org/forums/article.php?a=20
    Tom Hoskinson
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