Here are a couple more interesting facts. TEA can be used as PMK B in place of the Kodalk. It seems to be the one organic base Hutchings didn't try for his excellent book. The only ingredient of PMK that is not soluble in propylene glycol (if you excuse the used of a little TEA and water to separate the Metol base from its H2SO4) is the sulfite, and a little ascorbic acid will substitute for that. In that case, PMK A in glycol is not greatly diferent from Pyrocat MC A with pyrogallol instead of pyrocatechin.