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  1. #11
    Nicholas Lindan's Avatar
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    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  2. #12
    Nicholas Lindan's Avatar
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    The problem is air bubbles getting trapped under the reel. The root cause is not enough solution in the tank to float the bubbles higher than the tops of the reel. Lack of agitation compounds the problem. The problem is more common with developer as it has a slight tendency to foam and film is often stand developed with little if any agitation. This is the first time I have heard of problems with bubbles in the fix.

    If you go back through the archives you can find previous posts and examples of the problem.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  3. #13
    Photo Engineer's Avatar
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    As I remarked to David in the other similar thread, if the spots on the print are darker, then that means that the negative has light spots due to underdevelopment. In the OP, the spots are lighter which means that the negatives have darker spots.

    In any event, these are two different problems. One is caused by overdevelopment and the other is caused by underdevelopment. It is difficult to diagnose either exactly without looking at the negatives. For example, overdevelopment could be caused by insufficient wash/stop and fix at the edge of the reel. Overdevelopment could be caused by a small amount of photo flo contaminant (with some films and developers). Underdevelopment could be caused by insufficient developer solution or by a huge buildup of gunk on the edges of the reels.

    PE

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