The apparent superadditivity between Metol and ascorbic acid seems to be due to the ascorbate's ability to regenerate Metol. It is acting more as an antioxidant if that is true than as a developing agent. This is not my theory. I happened across it in Mees & James "The Theory of the Photographic Process" , fifth edition, third printing, 1969. I didn't see any speculation in that reference about the aminophenolate being formed in those experiments.
Originally Posted by Alan Johnson