本文件规定了一种通过消除镜面光泽的漫反射法测量纸张和纸板颜色的方法。 本文件不适用于含有荧光染料或颜料的彩色纸或纸板。它可用于测定含有荧光增白剂的纸张或纸板的颜色，前提是试样上照明的UV含量已调整为符合CIE光源C的要求，使用的荧光参考标准满足ISO？规定的国际荧光参考标准3级（IR3）的要求2469，由授权实验室提供指定的ISO亮度值，如ISO2470？1.

This document specifies a method for measuring the colour of paper and board by the diffuse reflectance method with the elimination of specular gloss. This document is not applicable to coloured papers or boards which incorporate fluorescent dyes or pigments. It may be used to determine the colour of papers or boards which contain fluorescent whitening agents provided the UV content of the illumination on the test piece has been adjusted to conform to that in the CIE illuminant C, using a fluorescent reference standard that fulfils the requirements for international fluorescent reference standards of level 3 (IR3) as prescribed by ISO？2469 with an assigned ISO brightness value provided by an authorized laboratory, as described in ISO？2470？1.