Tanning developer for color separation positives (dye-tone process).
| Ingredient | Quantity | |
|---|---|---|
| Sodium sulphite anhydrous | 50 | grams |
| Pyrocatechin | 20 | grams |
| Sodium carbonate anhydrous | 100 | grams |
| Potassium bromide | 4 | grams |
| Water to make | 1 | liter |
| Mix chemicals in order. | ||
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.