Response to Streaks on negatives

First, check your agitation. Is it up & down? This would cause the chemistry streak in the pattern you mention. Across the film from sprocket hole to sprocket hole. If you raise & lower the film in chemistry for agitation without 'twirling' it or changing your routine you will get chemistry flowing the same way every time. This will cause density differences in a pattern as it sounds you are getting here.

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