Yes, but I don't remember the results. I can try again. IIRC, the HCl was more soluble. Actually, if you can humble yourself as I have to using teaspoon measurements, It will be just about as quick to mix up the stuff in water solution as needed. I would probably play with the amount of sulfite, and probably use ascorbic acid with little or no sulfite to see what effect it has on print quality. I know there is a degree of synergism between p-aminophenol and AA as I found with Rodinal and AA.

It would be nice if a mixture were found that mimiced amidol at less cost and longer shelf life. I have an old 5X7 view camera that I seldom use. Maybe I should get it out and get some Azo while I still can.