Which three factors impact clearing time?

• A. Thickness of film emulsion, solution concentration and fixer exhaustion
• B. Temperature, agitation speed, and fixer exhaustion
• C. Developer strength, film speed, and washing time
• D. Exposure time, storage temperature, and film base

Answer: (A)

Clearing time depends on how quickly the fixer can reach and dissolve the unexposed silver halide in the emulsion. If the film has a thick emulsion, the fixer has a longer path to travel, so clearing takes longer. The rate at which clearing happens also relies on how concentrated the fixer solution is—the more active the fixer, the faster it can dissolve silver halide. Finally, if the fixer is exhausted and losing its effectiveness, its ability to clear decreases, causing longer clearing times. So thickness of the emulsion, fixer concentration, and fixer exhaustion are the factors that most directly control how long clearing takes. Temperature and agitation do influence clearing, but the three listed are the primary determinants in this context.