Optical brightener(Optical brightness agent): Synonymous with Optical bleaching agent.
光学增光剂：即光学漂白剂。
One of these parameters is ground whiteness which is obtained by first bleaching and another is optical whiteness process by optical brightening agent application.
其中一个参数是通过第一次漂白获得的地色白度，另一个参数是通过应用荧光增白剂获得的荧光白度工艺。
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