Effect of developing agents on the rate of fixation in monobaths were investigated. Experiments performed with simple monobaths containing different developing agents in the pH range 5-13, using a high-speed negative film and a motion-picture positive film, indicated that most developing agents prolonged the film-clearing time at relatively lower pH level (below 11) but didn't affect it at higher pH level (above 11). These effect of developing agents were also observed on the curves showing the relationship between processing time in monobaths and the amount of residual silver salt in film after completed washing. In view of the experimental results, it can be presumed that the decrease of the rate of fixation which depends on the developing agents in monobaths of relatively lower pH level is caused by adsorption of noncharged molecules of developing agents to gelatin or to the surface of the silver halide grains.