The strange purple color cast on the edge of the C41 film.

[Ppppuff Pastry]

I just developed a PORTRA 160. The developer was freshly mixed, with a development time of 3:15. The stop bath used dilute sulfuric acid—500ml that had already been used 8 times—but based on pH test strip results, its pH should be within the working range. The bleach was potassium ferricyanide bleach, used for 5 minutes, with 1L that had been used 14 times. Fixing took 5 minutes, using 500mL that had been used 4 times.
The result shows a green/purple color cast on one side of the film. I used rotary processing with a Jobo 1520 tank, and the color cast appears to be on the side closer to the bottom of the tank. There is no visible color cast on the unexposed areas of the film. Does anyone know what might be causing this issue?

 

[mshchem]

Guessing, some sort of chemistry contamination? Very odd pattern. You might try skipping the sulfuric and just use a vigorous water rinse.

 

[blee1996]

Light leak in the camera?

 

[gbroadbridge]

Assuming a roll of film, was it all frames or just the one frame?

If one frame I'd think a film handling or camera problem.