It does dissolve when I add more water.
Originally Posted by Kirk Keyes
My tap water is eminently suited for drinking because of its good taste and calcium content. It forms a precipitate in most developers that contain carbonate. I don't see that with this version of Metolal, but I have been using demineralized water. If I were to substitute an equimolar amount of p-aminophenol and reduce KOH accordingly, I would see no lingering precipitate. I can try that as soon as my shipment of p-aminophenol arrives.
I hate to try filtering the K2SO4 out of the precipitated metol freebase, but if everything else dissolved, that should tell me something. At the moment, I'm also fresh out of Metol.