In this chapter, the procedures involved in film processing, Development (purpose of solvent, developing agent, Activator, Preservative and Restrainer), Rinsing (water rinse and acid rinse), Fixing (Function of solvent, acidifier, clearing agent, hardening agent and preservative), Washing and drying are explained. It also explains about preparation of the baths, influence of time and temperature on film developing and the purpose of Replenisher.