Not sure if this is of help but some years ago when I just started in photography I developed a roll of Ilford XP2 in Rodinal. I don't remember the details but from memory the negatives appeared printable. XP2 is a chromogenic rather than a black and white film, this is as much as I can say on the subject. I know next to nothing about colour, but perhaps the analogy with XP2 is of use.(posted 8984 days ago)