Everyone, thanks for your contributions to my question, very much. I think it would be helpful—at least to me—to split the discussion off into two more threads, one dealing with sodium sulfite and the other about ammonium thiosulfate in KRST. This way, I would hope, we might get more contributions, now and in the future, as the current title of this thread is no longer applicable to those two trains of thought. New threads being posted in a minute or so.