Tanning developer for color separation positives (dye-tone process).

IngredientQuantity
Mix chemicals in order.
Sodium sulphite anhydrous50grams
Pyrocatechin20grams
Sodium carbonate anhydrous100grams
Potassium bromide4grams
Water to make1liter

Dilute 1:5 and develop about 8 minutes at 18.5°C. This formula also may be used at a dilution of 1:8 and development carried on for 15 minutes.