The evolution of cyan couplers for color paper and color negative is introduced, including the peculiar characteristics of the different couplers, reaction mecha. nism and application condition.

• 介绍了彩色相纸及负片用青成色剂的演变，包括各种类型青成色剂的优缺点、现行负片中青成色剂的作用机理、应用条件。