I have a formula for Rodinal Special SB in German that I found on the web some time ago, during the time that RS was no longer being produced (it's now back in production, I read). The formula calls for Kaliumsulfit -- Lsg.45%, which I read as Potassium Sulfite. Unfortunately, I cannot find anyone who sells it or even any reference to it existing -- Potassium Metabisulfite, yes, but Potassium Sulfite, no. Anyone who has photochemical experience in German out there who can tell me what is needed? FYI, the other components are Potassium Bromide, Triethanolamin, Hydroquinone, Phenidone and EDTA -- plus some water, of course.