Originally Posted by
Doremus Scudder
Since the rebate of the film is exposed, I believe that the light strike is happening when the film is out of the holder. The rebate rails cover the film and hide it from light strikes in-camera (or exposing the film normally would expose the rebate too...). I'd have a look at your development tank for cracks, missing seals, whatever that might cause a light leak. Also check your film-loading/unloading environment (darkroom/changing bag) for stray light and leaks.
Yes, pulling the back away from the camera body when pulling/inserting the darkslide is a common cause of light strikes, but the exposed rebate tends to rule that out in this case. (Do pinch back and camera body together with your free hand when pulling and inserting the darkslide, however!)
Lastly, check your holders for cracks along the side seams. I had a few that leaked that way; letting light in right at the side of the film. Toyo holders are pretty well-built, however.
By the way, the flap on film holders will not leak light as long as it is closed and the darkslide inserted. The condition of the tape is irrelevant; it is only there as a hinge. The design of the flap has baffles that make it light-tight when closed unless the flap itself is damaged or warped. The myth that faulty or missing hinge tape causes light leaks is rather prevalent here, but false.
Best,
Doremus
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