A concentrated, Phenidone-only developer (J. D. Kendall)

A concentrated, Phenidone-only developer (J. D. Kendall)

  1. michael_r

    michael_r Subscriber

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    Michael R 1974 submitted a new resource:

    A concentrated, Phenidone-only developer (J. D. Kendall) - A concentrated, Phenidone-only developer (J. D. Kendall)

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    Last edited by a moderator: Feb 6, 2016
  2. Ian Grant

    Ian Grant Subscriber

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    I have it as a Phenidone equivalent of ID-3 (similar to Selectol Soft/D165) it's adjusted to make 1 litre:

    Example 1

    Phenidone 6 gm.
    Sodium sulphite (anhyd.) 25 gm.
    Sodium carbonate (anhyd.) 37.5 gm.
    Potassium Bromide 1gm.
    Water to make 1 litre

    To use 1+3

    Results are similar in characteristics to a Metol only developer using the same weight of developer,
    only softer.

    It's unusual as it has a very high level of Phenidone unlike the usual substitutions.

    All the examples in the Patent are Phenidone substitutions for Metol in existing Metol or MQ formulae, so ones a Phenidone/Pyrogallol developer.

    Ian
     
  3. michael_r

    michael_r Subscriber

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    It would be interesting to test this formula. Substitutions of Phenidones in place of Metol are viable when the developer contains a secondary superadditive agent, but I would not expect using Phenidone only in place of Metol in a Metol-only developer would work very well, if at all. For example, you cannot make a Phenidone-only version of D-23.

    Perhaps the relatively high pH of this formula helps, but I'd still expect either very low contrast or high fog. An interesting formula.

    I'll post a few other interesting Axford/Kendall things from Haist in separate articles.