CIE1976 L *a *b * color system was performed to record the chromaticity parameters of the samples. The C *ab and H 0ab of the samples of each groups was calculated.

• 白度色度计检测试件的色度参数 ,采用CIE1976L a b 表色系统 ,求取各组样本彩度值C ab及色相角H0 ab。