Quote Originally Posted by Ed Sukach
One thought ... I've found the use of shortstop (1% acetic acid) to be *essential* between color developer and bleach-fix in RA4 printing.
Kodak actually recommends using acetic acid stop bath for tray and rotary tube processing of their RA-4 papers. I have noticed that skipping stop bath causes uneven magenta streaks with Kodak Endura papers.
Citric acid odourless stop bath may cause brown stains. Personally I once encountered this when trying to use Ilfostop for color processing.