Quote Originally Posted by Gerald C Koch View Post
Benzotriazole is difficult to dissolve in water and its solubility is about 20 g/l. Therefore trying to dissolve 10 g in 500 ml of water may be a bit difficult. Solutions more concentrated than 1% may exhibit precipitation of the solid when stored at lower temperatures. Traditionally photographers have used a 1% solution for this reason.
Isn't 20g/l and 10g/500ml the same ratio?