1.1本试验方法主要用于在日光照明下对均匀、非荧光、几乎无色透明或几乎白色半透明或不透明塑料的黄度（或黄度变化）进行仪器测量。测量在颗粒上进行，并基于使用分光光度计或色度计获得的三刺激值。 1.2本试验方法适用于塑料颗粒的颜色分析。每种材料都可能具有决定颜色值的独特特性。 1.3本程序概述了确定颜色测量值的方法，例如黄度指数、CIE X、Y、Z和Hunter L、a、b或CIE L*、a*、b*。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 注1-没有等效的ISO标准。

1.1 This test method is intended primarily for the instrumental measurement of the degree of yellowness (or change of degree of yellowness) under daylight illumination of homogeneous, nonfluorescent, nearly-colorless transparent or nearly-white translucent or opaque plastics. The measurement is made on pellets and based on tristimulus values obtained with a spectrophotometer or colorimeter. 1.2 This test method is applicable to the color analysis of plastic pellets. Each material may have unique characteristics that determine the color values. 1.3 This procedure outlines a method to determine color measurements, such as Yellowness Index, CIE X, Y, Z, and Hunter L, a, b, or CIE L*, a*, b*. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Note 1—There is no equivalent ISO Standard.