Color Developing problem: dark streaks on the sky (or smooth zone)

Discussion in 'Color: Film, Paper, and Chemistry' started by Giorgio_23, Sep 4, 2011.

  1. Giorgio_23

    Giorgio_23 Member

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    Hello,
    I collaborate with my color lab that develops and prints color negatives. Lately we have some problem with film developing: we have some dark streaks on the sky, especially when the sky is a large and smooth zone in the frame. Or maybe we note it only in these frames because they are smooth, altough not all the frames have this problem.
    I don't understand what causes this developing problem, so we use a professional giant vertical chassis machine in which films are vertical and change automatically each bath with timer. Chemicals are obviously fresh.

    What do you think?
    help!

    Thank you