[Maine-iac]

I have found that a small amount of ascorbic acid in, say, a Metol-hydroquinone solution seems to be capable of at least as much superadditivity as the MQ solution with sulfite. It will be a staining developer if used without sulfite, as would the combination of Metol-pyrogallol-ascorbate or Metol-catechol-ascorbate, or p-aminophenol-catechol-ascorbate. I only know these things from experiment.

Pat,

I've never tried using Vitamin C with an MQ developer for film; I have used it in paper developer concoctions, where the staining doesn't appear to happen. I'd be interested in trying it with film. What proportions of M, Q, and C do you use? What activator--carbonate? metaborate? borax? How long?

Larry