Dan Smith , Nov 22, 1998; 10:07 a.m.
The purple comes off Tmax films with a decent rinse. Unless the negs were cloudy you probably did not need to re-fix. Leaving them in the fix for along time allows the acid to eat away the emulsion, and yes, it will do strange things to the negs.
Since they are a lost cause now, print from them and see how the images look. Maybe your darkroom accident can be turned into a new tool for creativity with a bit of experimentation.