Joe, just I re-developed a toned reject in Peroxide. Seemed to bring a little blue/purple dmax increase in the very darkest of tones, other than that, not much happened.
Some come out a bit purple, some pink, some orange or tan. It seems to vary by the exposure and bleaching ratio. Less exposure with more bleaching and toning tends to tan/orange. More exposure with less bleach seams to be purplish. The middle ground seems deep pink. Sometimes I get split tones.
I've done it with ammonia. Ammonia totally destroys some papers, tends to bleach unevenly, and it's just nasty to work with compared to the soda.