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  1. #1
    BetterSense's Avatar
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    DK-25R with teaspoon method

    Does anyone have a volume-based recipe for DK-25R?

    I just mixed up some D23 using 2 level teaspoons of metol and 4 level tablespoons of Sodium Sulfite in a liter of water. I

    I can't find a recipe for DK-25R, however, and I don't know how dense sodium metaborate is.
    f/22 and be there.

  2. #2
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    !0 gms metol, same sodium sulfite, 15 gms Kodalk. I use 1 TBS metol (10.5 gms) and 1 TBS - 1/8 tsp of Kodalk to make my DK25R. Been doing it for years. As we say here in Northern Virginia, "Close 'nuff fur gummint work."

    I am down to my last jar of Kodalk before going to Sodium Metaborate.
    John, Mount Vernon, Virginia USA

  3. #3
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    Quote Originally Posted by BetterSense View Post
    Does anyone have a volume-based recipe for DK-25R?

    I just mixed up some D23 using 2 level teaspoons of metol and 4 level tablespoons of Sodium Sulfite in a liter of water. I

    I can't find a recipe for DK-25R, however, and I don't know how dense sodium metaborate is.
    ********
    By the way, the old darkroom rats would make up "D23" by just mixing an ounce of metol to a pound of sodium sulfite in a gallon of water.

    It's a couple ounces heavy on the sulfite, but for souping with D23 1:1 or 1:3 I can't imagine it would make much difference.
    John, Mount Vernon, Virginia USA

  4. #4
    Photo Engineer's Avatar
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    Remember that the volume / weight values can vary by +/- 10% depending on batch of chemistry due to crystal type. This means that you may get powder from one company and large crystals from another. So, to be a "real" photographer scratch mixing chemistry, volumetric measure is the worst way to get good results.

    PE

  5. #5
    BetterSense's Avatar
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    I didn't want to mix up a whole gallon, though. I actually only had wine bottles so I mixed up 750mL, which made the math a bit tricky.

    1.5tsp. metol, 3tbsp. SS. to make 750mL D-23

    Then I mixed up 333mL of DK-25R

    1 tsp metol, 1.5 tsp kodalk, 4tsp SS to make 333mL DK-25r.

    I should really get a scale, but all the electronic kitchen scales only go to +/- 1g.
    f/22 and be there.

  6. #6
    Photo Engineer's Avatar
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    If you wish to do scratch mixes, you need a scale or balance accurate to 0.1 gram. I suggest you use that to damp out your variability from batch to batch or to use off the shelf chemistry.

    PE

  7. #7
    BetterSense's Avatar
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    Anyone suggest a starting time for Tri-X at 250? It's hard to find data for D-23; there's only one entry in the MDC and I don't trust the MDC.
    f/22 and be there.

  8. #8
    Anscojohn's Avatar
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    Quote Originally Posted by BetterSense View Post
    Anyone suggest a starting time for Tri-X at 250? It's hard to find data for D-23; there's only one entry in the MDC and I don't trust the MDC.
    *******
    I have long used eight minutes at 68 F at EI 200. It gives a good, gutsy neg with loads of shadow detail, good highlight separation, and still printable highlights. In a very contrasty light--if high tones are important, you might wish to cut back a bit--otherwise, let 'em fall where they may. I use standard ASA agitation.

    Regarding P.E.s comments. I agree with him. But I mostly use all the same few chemicals and, just for kicks, I check my spoon measurements against a scale once in a while. I have a powder scale for reloading ammunition: it is accurate to 1/10 grain. Biggest problem for this math-challenged former history major is converting those @#$ grains to grams (groan).
    John, Mount Vernon, Virginia USA

  9. #9
    BetterSense's Avatar
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    I used eight minutes for my first roll. The negs look pretty good so far; plenty of density. I mis-spooled them on the reel again though and lost the last foot of my roll. I have the hardest time with 35mm film.
    f/22 and be there.

  10. #10

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    [QUOTE=Anscojohn;826431 Biggest problem for this math-challenged former history major is converting those @#$ grains to grams (groan).[/QUOTE]

    Use Google!

    You can type conversions into the search engine and let Google do the conversion for you. For example, type "convert 50 grains to grams" and click on search and Google will return with "50 grains = 3.2399455 grams". Easy!
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

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