What is fogging in film processing?

• A. Exposure to natural light causing the film to darken
• B. Overdevelopment of the film
• C. Underexposure to X-ray
• D. Scratches on the film surface

Answer: (A)

Fogging is unintended exposure of the film emulsion to light during processing, which causes a uniform darkening of the film and reduces image contrast. It happens when stray light leaks into the darkroom or processor, or when film is exposed to daylight before processing. The result is a background density that can obscure fine details. This is distinct from overdevelopment (which changes density due to processing conditions after the image is formed), underexposure to X-ray (which would make the image too light), or scratches (which create surface artifacts). So exposure to natural light causing the film to darken best describes fogging.