Darkroom fogging primarily affects contrast in which density range?

• A. reduces film contrast in the mid-density range
• B. increases film contrast in the shoulder range
• C. has no effect on density ranges
• D. reduces film contrast in the toe range

Answer: (A)

Darkroom fogging is extra, unintended exposure from safelight and stray light that adds a uniform density to film before processing. This raises the base density and fills in differences between adjacent densities, effectively reducing overall contrast. The film’s density vs. exposure curve is steepest in the mid-density range, where small exposure changes produce large density changes. When fog adds a constant amount of density across the board, that steep portion becomes flatter, so the distinctions between neighboring mid-range densities blur the most. The toe and shoulder regions are less affected because they’re already approaching the limits of the curve, where changes in exposure yield smaller density differences. So the mid-density range loses the most contrast due to darkroom fogging.