Strange greenish tan/brown backing on Ektachrome film.

[Shootar401]

I developed a roll of Ektachrome today and I noticed that the backing on the film was a ugly green color. The film itself looks fine when viewed on the light table, and butt ugly when turned over. I never noticed this before. Anything I should be worried about? The images and edge numbers are fine, so it was developed correctly.

[David Lyga]

When I process reversal film in C-41 I sometimes get the same. In my specific case it is due to inadequate fixation. That might be all you need to do; maybe not in your case, though. - David Lyga