I have some Potassium Bromide from a friend and it has backed together. Now I would like to use it for developers. As far as I know it last indefinitely. What I am concerned about is how to measure it for recipes. Should I leave the bottle open and measure it as monohydrate after awhile. Or put it in my oven and dry it out and use it as anhydrous. Or discard of it. In recipes they always talk about anhydrous and monohydrate sodium carbonate but not with other chemicals much.