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Classic pyro developer.

Solution A
Potassium metabisulphite9.8grams
Potassium bromide1.1grams
Water to make1liter
Solution B
Sodium sulphite anhydrous105grams
Water to make
Solution C
Sodium carbonate monohydrate75grams
Water to make1liter
Mix chemicals in order.

For use in tank, take 162 mililiters each of Solution A, B and C and add water to make 3.78 liters. Developing time about 10–15 minutes at 18.5°C.

For tray use, dilute 1:1:1:7 and develop about 6 minutes at 18.5°C.

As a rule, contrast and density may be increased by decreasing the recommended amount of water to dilute the stock solution by 50%–66%. Softer negatives can be obtained by using 50%–100% more water than is specified for normal results.