Hypo clear agent (HCA) is almost entirely sulfite. XTOL, D-76, and similar are high in sulfite. That got me wondering: When using developer as a one-shot, could I use the used developer as HCA? That is, pour the dev back into the tank after fixing to help remove the thiosulfate. Is there any harm in doing this? Mark Overton EDIT: The title should have been "one-shot", not "old-shot", and edit won't let me edit it. Sigh.