Quote Originally Posted by sanking View Post
However, both Pyrocat-MC and 510 Pyro contain ascorbic acid, which slows down the rate of oxidation and lengthens the useful life of the working solutions compared to pyrogallol and pyrocatechin formulas that do not contain ascorbic.

Sandy King

Does that make the 510 as suitable to for roller development as Pyrocat-MC, or is there something more at work with the pyrocatechen based formula?