On subjects having violent contrasts where it is necessary to show detail in both highlights and shadows, an acid-amidol developer can be used.

IngredientQuantity
Mix chemicals in order.
Sodium bisulphite12grams
Amidol10grams
Sodium sulphite8grams
Water to make
1
liter

With this developer at 18.5°C, the image usually appears in 10 to 15 minutes and the total time of development is usually about 2 hours though it can be carried on for 12 hours if necessary.