Quote Originally Posted by gainer View Post
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.
What would be the advantage of mixing up PMK in glycol? The shelf life is already astounding. Please correct me if I'm wrong, but I understood that the use of glycol was to enhance shelf life of the stock solution. PMK is already near-immortal with plain distilled water.

You've given me lots of interesting ideas to try with your posts by the way - please continue