薄纸和薄纸制品第7部分:光学性能的测定用D65/10°测量亮度和颜色（室外日光）

[中文适用范围]： 本文件规定了在室外日光条件下用仪器测定薄纸和薄纸产品的亮度和颜色的测试程序。 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：被称为 ISO 亮度和 C/2° 颜色（室内日光）的属性是使用调整到比本文件中指定的紫外线含量低得多的仪器来测量的。 ISO 12625-15 中描述了 C/2°（室内日光）下的 ISO 亮度和颜色测量。 [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 under outdoor 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 ISO brightness and colour with C/2° (indoor daylight) are measured with an instrument adjusted to a much lower UV content than that specified in this document. The measurements of ISO brightness and colour with C/2° (indoor daylight) are described in ISO 12625-15.