This is a rapid developer for commercial use with fast enlarging papers, producing neutral black tones.

IngredientQuantity
Mix chemicals in order.
Metol
3.3
grams
Sodium sulfite anhydrous
33.5grams
Hydroquinone
10
grams
Sodium carbonate anhydrous
56
grams
Potassium bromide
3.3grams
Water to make
1
liter

Dilute 1:2 and develop for 1–2 minutes at 20°C.