Developer for blue/black tones on contact papers (such as Gevaert “Ridax” paper).

IngredientQuantity
Do not dilute.
Metol
2.5
grams
Sodium sulfite anhydrous
25grams
Hydroquinone6grams
Sodium carbonate anhydrous
40
grams
Potassium bromide0.5
grams
Water to make
1
liter

Develop papers for 1 minute at 20°C.