Are there any other film developer formulas using p-aminophenol other than Rodinal (and its versions such as R09 etc) and now Sandy's pyrocat-P? Also, although recipes for do-it-yourself Rodinal specify the hydrochloride, I read that it becomes the non-hydrochloride part way through the mixing. So can the plain p-aminophenol be used for a Rodinal clone, or is the hydrochloride necessary? Also, since Rodinal is reported to make a very nice warm tone print developer, are there any formulas for using p-aminophenol to make a warm tone print developer? Part of my curiosity stems from the comparatively low price of p-aminophenol.