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  1. #1

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    Kalogen (MQ Rodinal Substitute)

    A developer called Kalogen was first marketed in 1917 by Paul L. Anderson. For years, photographers had favored a German developer called Rodinal. With the outbreak of World War I, Rodinal was no longer available. Anderson created Kalogen to remedy this situation. The formula appeared in his book "The Technique of Pictorial Photography", J. B. Lippincott, 1939.

    Distilled water (50°C) .................. 750 ml
    Metol ....................................... 13.5 g
    Sodium sulfite (anhy) ................... 180 g
    Hydroquinone ............................. 53.0 g
    Sodium hydroxide ........................ 35.0 g
    Potassium bromide ....................... 5.0 g
    Benzotriazole, 1% ........................ 80.0 ml
    Distilled water to make ................. 1.0 l

    Method of Preparation

    Weight out the Metol and sulfite. Dissolve a pinch of the sulfite in the water before adding the Metol. Dissolve the other ingredients in the order given. A precipitate will form upon the addition of the hydroquinone which will dissolve upon the addition of the sodium hydroxide.

    Transfer the solution to a 1 liter glass or plastic PET bottle, stopper and allow it to stand for 2 to 3 days. A small amount of impurities will precipitate out and the solution will become lighter in color. Filter the solution and transfer it to several small (2 to 4 ounce) glass bottles and label. When prepared correctly the solution will be a clear pinkish tan color.

    When stored in nearly full and tightly capped small bottles, the stock solution will keep for months at room temperature. Should any crystals form due to storage at low temperature, they may be redissolved by warming and shaking the bottle.

    The concentrate is diluted 1:30 to 1:60 for films. For 1:60 the average development time is 5 min @ 22C. Kalogen also makes an excellent paper developer when diluted 1:12 to 1:15 producing results similar to D-72. Develop 2 to 2-1/2 min @ 22C. The formula was published by Walter C Snyder, Dignan Newsletter, August 1973, pp 13-14.

    Walter Snyder in the Dignan Newsletter article said that the original formula called for 9 grams of potassium bromide. He reduced the amount and added the benzotriazole. He made other changes to the original formula changing the Metol/hydroquinone ratio from 1:2 to 1:4. I have the feeling that he never adjusted the sodium hydroxide amount which may explain why there is an excess. I calculate 26 grams for 98% purity sodium hydroxide as enough to just create the phenolates."
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  2. #2
    Oxleyroad's Avatar
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    Should this be placed in te article section?

    Easier for me to find later.
    Cheers - Andy C
    ---------------------

    16mm Cine, 35mm, 120, 5x4 & 7x5.

  3. #3

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    I was not allowed to do that. Got message that the forum was closed. Perhaps one of the monitors can do this.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery



 

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