卫生纸和卫生纸制品.第15部分:光学特性的测定.用C/2°（室内日光）光源测量亮度和颜色

[中文适用范围]： 本文件规定了在室内日光条件下对薄纸和薄纸产品的亮度和颜色进行仪器测定的测试程序。 它还提供了有关测试件（单层、多层产品）的准备以及产品的光学测量的具体说明，其中可能需要采取特殊的预防措施。 注：称为 D65 亮度和颜色的属性是使用调整到比本文件中指定的 UV 含量高得多的仪器来测量的。 [外文原描述]： This document specifies testing procedures for the instrumental determination of brightness and colour of tissue paper and tissue products viewed in indoor daylight conditions. It also gives specific instructions for the preparation of test pieces (single-ply, multi-ply products) and for the optical measurements of products, where special precautions can be necessary. NOTE The properties called D65 brightness and colour are measured with an instrument adjusted to a much higher UV content than that specified in this document.