What term describes the optical density of film due to base density plus the effect of developer on unexposed silver halide crystals?

What term describes the optical density of film due to base density plus the effect of developer on unexposed silver halide crystals?

• A. Base density
• B. Base plus density
• C. Emulsion inheritance
• D. Base oxidation

Answer: (B)

Optical density on processed film is the sum of two contributions: the base density from the film base itself and the additional density created by the developer acting on silver halide crystals, including unexposed ones. This total is described as base plus density. The base provides the inherent, uniform density of the film, while the developer’s action—sometimes referred to as fog when it affects unexposed grains—adds extra density that increases overall darkness. So, the best term for the combined effect is base plus density.

Optical density on processed film is the sum of two contributions: the base density from the film base itself and the additional density created by the developer acting on silver halide crystals, including unexposed ones. This total is described as base plus density. The base provides the inherent, uniform density of the film, while the developer’s action—sometimes referred to as fog when it affects unexposed grains—adds extra density that increases overall darkness. So, the best term for the combined effect is base plus density.