General-purpose PQ formula for roll films, flat films and plates.
| Ingredient | Quantity | |
|---|---|---|
| Sodium sulphite anhydrous | 75 | grams |
| Hydroquinone | 8 | grams |
| Sodium carbonate anhydrous | 37.5 | grams |
| Phenidone | 0.25 | grams |
| Potassium bromide | 2 | grams |
| Benzotriazole 1% solution | 15 | mililiters |
| Water to make | 1 | liter |
| Mix ingredients in order. | ||
Dilute 1:2–5. Develop 4.5–9 minutes at 20°C.