ISO 2470-1:2016规定了纸浆、纸张和纸板蓝色漫反射系数（ISO亮度）的测量方法。 ISO 2470-1:2016仅限于白色和近白色纸浆、纸张和纸板。只能在仪器中进行测量，在仪器中，使用荧光参考标准调整照明的紫外线能级，使其与CIE光源C[6]相对应。CIE光源C被视为室内日光条件的代表，因为它包含适当比例的紫外线辐射。[9]

ISO 2470-1:2016 specifies a method for measuring the diffuse blue reflectance factor (ISO brightness) of pulps, papers and boards. ISO 2470-1:2016 is limited in its scope to white and near-white pulps, papers and boards. The measurement can only be made in an instrument in which the ultraviolet energy level of the illumination has been adjusted to correspond to the CIE illuminant C[6] using a fluorescent reference standard. The CIE illuminant C is taken to be representative of indoor daylight conditions because it contains a suitable proportion of UV radiation.[9]