它具有优良的光学性质和颜料性能，纯度高，白度，色彩还原能力和分散性。
It has excellent optical character and pigment performance, high purity, whiteness, tint reducing power and dispersibility.
由此可见，白度是指肉眼直接观察的对比结果，而亮度则是指光学反射的对比结果。
It can be seen, then, that whiteness is directly determined through comparative ocular eye, whereas brightness refers to comparative optical reflectance.
光学漂白剂：混入造纸浆料内，增加光白纸张的白度的化学剂；它的作用是使紫外光转为可见光。
Ooptical bleaching agent: a chemical which is used in the furnish of bright-white papers to enhance their brightness, and which does so by converting ultra-violet light into visible light.
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