It is usually the first stage in toning and intensification processes, and an important stage in most color chemical developing systems. (2) Chemical process on papermaking to whiten the pulp.

• 是大多数彩色投影法里的主要步骤；亦是一般加厚和加色过程里的第一个步骤。（2）造纸过程里，漂白纸浆的方法。