Diagnosing light edges on images (dark edges on negatives)

Since I’ve started developing my own film, I’m pleased to say I have yet to ruin any of the dozens of rolls of film I’ve processed at home — every single roll has resulted in usable negatives, with seemingly proper density. However, something has been dogging me, and I only recently discovered that it was my own fault: Images with light edges (on the positives), dark edges (on the negatives).

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