Eugene, you are correct that Angier gives priority to the anhydrous form in Chap III subsec 6under the discuss Anhydrous and hydrated salts.(p33) However on p45 under Copper salts he contradicts himself Stating Copper Salts are a very frequent component of brownes...........They are all hydrated salts, their relative compositions being: CuSO4, 5 aq . My source is reagent CuSO4,5H2O. I have found that any increase in Copper ions/mole count much above that stated in my earlier response results in a certain coppering during initial coatings.
I have used the above formulation with good results.