I have light streaks of discoloration running across my prints and negatives. What causes this?
Cross-streaks on your film or prints may be the result of reverse winding. Reverse winding occurs when you turn the rewind knob or lever in the wrong direction, causing the film to fold back over itself inside the film cartridge. This folding creates stress on the film, especially in those areas adjacent to the sprockets. These stressed areas show up in the processed slides or prints as plus density streaks. In low humidity situations, reverse winding may cause the film emulsion to crack or the film to even break.
Reverse winding most often occurs when the exposed film is being rewound into the film cartridge. However, the problem can also result from improper loading procedures. Some photographers are in the habit of using the rewind lever to stretch the newly loaded film taut across the camera back.
If you turn the lever in the wrong direction, reverse winding stress marks can result. If rewound far enough in the wrong direction, the film will bind in the cartridge, preventing it from advancing at all. Consult your camera owner's manual for proper loading procedures.
Cross-streaks on your film or prints may be the result of reverse winding. Reverse winding occurs when you turn the rewind knob or lever in the wrong direction, causing the film to fold back over itself inside the film cartridge. This folding creates stress on the film, especially in those areas adjacent to the sprockets. These stressed areas show up in the processed slides or prints as plus density streaks. In low humidity situations, reverse winding may cause the film emulsion to crack or the film to even break.