Dr. Beers Variable Contrast "Developing Out" Paper Developer

Dr. Beers Variable Contrast "Developing Out" Paper Developer

  1. Kino
    Dr. Roland F. Beers give directions for stock solutions of a developer which may be combined in different proportions so that it will provide a progressive range of contrasts.

    Solution A
    Metol 8 grams
    Sodium Sulphite 23 grams
    Potassium...
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