I have used gallons of this and it's excellent..

ave made the quantity as follows because I can get the potassium sulphite in a 1 liter bottle and make a complete batch..

Ianol:
Higher pH
p-Aminophenol.(free base) ................... 53 g-----58g new recipe
Potassium sulphite 45% sol...................... 1L
Potassium Hydroxide ........................... 54 g------59g new recipe
Potassium Bromide ............................. 13 g
Benzotriazole 1% ............................... 13 ml
Water to make .................................. 1.3 L

Stock pH 13.2