Sorry about that. I think you think I'm trying to theorize about synergism. (We used that term at NASA as applied to human endeavors. Sometimes two persons can do more work together than the sum of what the two can do seperately.) All I wanted to know at first was whether it was reasonable to expect ascorbic acid to do the same job of promoting synergism between developing agents. The graph I sent did not satisfy me because it only dealt with one agent, considering that ascorbate is not much of an agent at pH 8.7
but neither is hydroquinone. I have the answer. Thanks.