Response to PMK: how much developer for a 35mm film?

John, I have used home made pmk pyro of some time, and I find the best stain comes with old technology films; FP4+ and HP5+, the latter having much more stain. Two things seem to increase the stain, one, the amount of air in the tank (therefore more oxidation) try processing a single film in a large tank with only enough developer to cover the film. Two, long washing in colder water (here in England the water runs at about 16 degrees even in summer), this helps the harding action the staining. Yours Jeff

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