Quote Originally Posted by mts View Post
You should put a sulfite stop bath (acetic acid + sulfite) between your color developer and bleach, and it doesn't hurt to add a rinse after the stop. You do not want to contaminate the bleach with color developer and thereby produce staining.
FWIW, Kodak's official process specification does not include a stop bath, at least not in the documents I've got on hand. I've just double-checked, and my Kodak Color Darkroom Dataguide (1996 edition), p. 22, lists the process exactly as I did above, except they don't mention a water bath pre-heat and their wash times are 3:15 rather than the slightly longer times I use. A Kodak PDF (publication Z131-03) gives precisely the same sequence as the Dataguide book. Perhaps there are situations where a stop bath would be helpful, but I don't know what they are. Perhaps PE could chime in on this one....