I read and reread the other thread long ago. Nowhere in it was there an indication that, let alone an explanation of how, precipitated p-aminophenol could affect the pH of a solution. Neither was there any prediction of exactly what would be the practical effects of mixing the ingredients in a different order. Furthermore, the fact that the Wolfen formula specifies p-aminophenol, not the hydrochloride, indicates that if the lacking potassium or sodium chloride is important, it did not seem so to AGFA. These are your theories that you could test in short order and perhaps explain in even shorter order.