Response to Dark patches along bottom edge of 120 negatives

Dont't think too complicated (I'm waiting for someone who will explain it with the "Xtol-failure"). That's definitely just stray light on the film edges. It may happen while loading or unloading the film or while preparing it for development. It can occur occasionally, because just a few seconds more or less in the light can make all the difference. Additionally, high-speed film is more susceptible than slow films (surprise). Some types of film seem to be wound looser than others (from factory on). Heat, vibration etc. also may loosen the film. Other (unlikely) explanations: the magazine leaks light (but in this case the darkening would affect a greater area) or the fixer didn't reach the film at areas, where it is in contact with the reels (but this would cause shiny patches, not dark).

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