Classic pyro developer.
| Ingredient | Quantity | |
|---|---|---|
| Solution A | ||
| Potassium metabisulphite | 9.8 | grams |
| Pyrogallol | 60 | grams |
| Potassium bromide | 1.1 | grams |
| Water to make | 1 | liter |
| Solution B | ||
| Sodium sulphite anhydrous | 105 | grams |
| Water to make | 1 | liter |
| Solution C | ||
| Sodium carbonate monohydrate | 75 | grams |
| Water to make | 1 | liter |
| 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.