General-purpose PQ formula for roll films, flat films and plates.

IngredientQuantity
Mix ingredients in order.
Sodium sulphite anhydrous75grams
Hydroquinone8grams
Sodium carbonate anhydrous37.5grams
Phenidone
0.25grams
Potassium bromide2grams
Benzotriazole 1% solution15mililiters
Water to make
1
liter

Dilute 1:2–5. Develop 4.5–9 minutes at 20°C.