Quote Originally Posted by hpulley View Post
Magenta changes the contrast of multigrade paper. ...
That does not matter in a consistent process. The influence is minimal and consistent.

Quote Originally Posted by hpulley View Post
... If you plan on reusing developer it is the wrong dye perhaps for other films and you wonder if dyed developer should be used again. ...
A literature search reveals no known influence of one film's anti-halation dye on another film's development behavior, but it is another reason for one-shot processing. Anyway, a 5-minute presoak does not remove the entire dye. It just makes it easier for the following process steps to remove it. The pre-soak does not free the developer from the dye, nor does the dye hamper the developing process.

The whole concern about the dye is more a cosmetic issue than anything else.