The circular marks are most likely drying water spots. During processing, the film’s gelatin emulsion swells in the chemistry and then shrinks again as it dries. If water beads or pools on the film, those areas can dry differently and may leave mineral residue or even permanent drying marks.

What to do:

• Try rewashing the film and use a proper final rinse/wetting agent, then hang it to dry so water sheets off rather than beading.
• Use clean/distilled water for the final rinse if your tap water is hard.
• Don’t let droplets sit on the film while drying.

If the spots are only mineral deposits, a rewash may help. If the emulsion dried unevenly, some marks may be permanent.

The magenta/purple look is often a scanning or color-balance issue rather than a film stock trait. It can also point to C-41 processing problems such as incorrect chemistry, temperature, timing, or exhausted/contaminated chemicals. Start by checking whether the negatives themselves look normal in color and density, then review your process and scanner settings.