本方法用于测定白色或近白色试样的CIE白度和着色指数（1），无论是否使用荧光增白剂。白度与纸张亮度的根本区别在于，白度包括其评估中的整个可见光谱，而亮度仅包括光谱中的蓝色部分。

This method is to be used to determine the CIE whiteness and tint indices (1) of white or near white specimens with or without optical brighteners. Whiteness differs fundamentally from paper brightness in that whiteness includes the entire visible spectrum in its assessment whereas brightness includes only the blue portion of the spectrum.