Several months ago I bought a bottle of vitamin C at the health-food store to use for developing (E-76, Rodinal, etc.) and haven't opened the bottle yet, (but too late to return it) but I just now noticed on the front it says, "non acidic". Well, of course that made me wonder what is in the bottle. It turns out that it is not sodium ascorbate, but calcium ascorbate. I *think* that it's the same type that I've used successfully with E-76 before, but it may explain why my Rodinal w/vitamin C attempts were less than stellar. Can calcium ascorbate be subbed for sodium ascorbate? And if so, can it be subbed equally? Obviously this changes the ph of any soup to be made, but how much and how to compensate? Does it change dev times any? Anything else I might need to know??? All is not lost, however; I can add it to beer and make a health drink out of it!