High contrast developer for films.

Mix chemicals in order.
Solution A
Sodium bisulphite22.5grams
Potassium bromide22.5grams
Solution B
Sodium hydroxide52.5grams
Cold water to make1liter

The sodium hydroxide should not he dissolved in warm water, as spattering is apt to occur.

This developer does not keep and should he freshly made.

Mix 1:1 and develop about 2 minutes at 18.5° C.