I am new to film photography but not to digital. With that being said I am just dying to try the cafenol as it has one of the longest shelf lives ever and I can mix it up as I need it. I bought the powdered D 76 and the powdered fixer thinking I could mix that up as I needed it from the powder. (That worked well[?]) Since the goal here is to reflect my poor student pocketbook (and impatience), can I grind up vitamin C tablets? Or would the additives in the tablets interfere in the developing? Thank so much.