I ran out of Pyrocat so I tried developing my HP5+ in DD-X. Much to my surprise, there was almost none of the magenta dye which appears when I use PyroCat. I'm not even certain there is any at all.
Sandy King recommended a Sodium Sulfite bath after fixing, to remove the dye, and it works fairly well, but it sure is nice not to have any to start with.
Does DD-X contain something in it which eliminates the dye ? Is the dye not really dye per se, but an artifact of Pyrocat ?