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ID-13 Ilford Hydroquinone Caustic Developer
| Stock Solution A | ||
| Hydroquinone | 25 g | |
| Potassium Metabisulphite | 25 g | |
| Potassium Bromide | 25 g | |
| Water to | 1 litre | |
| Stock Solution B | ||
| Potassium Hydroxide | 50 g | |
| Water to | 1 litre | |
To use: Mix immediately before use - 1 part A +1 part B Development times 2½ -3 minutes @ 20°C