1.1 本试验方法涵盖了CIE（国际照明委员会）近透明液体样品颜色三刺激测量的仪器方法。透射测量值被转换为铂-钴（Pt-Co）系统中的色标。 1.2 已发现该试验方法适用于无雾的透明液体样品的颜色测量，标称Pt-Co颜色值在0-100范围内。它适用于具有与Pt-Co彩色标准溶液相似的光吸收特性的非荧光液体。 1.3 三刺激比色法可以从光谱测量中计算，或者可以直接从色度计中获得。实践 E1455 提供了一些色度计的指导，而测试方法 D1686 和 D2108 处理近透明液体的视觉和仪器测量。 1.4 在使用该方法确定试验结果是否符合适用规范时，应根据实践中的舍入方法对结果进行舍入 E29 . 1.5 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 测试方法中定义的Pt-Co颜色测量的主要目标 D8005 ，是对特定材料的黄度进行评级。 这种黄色通常是由于加工、储存或运输过程中的污染导致液态碳氢化合物吸收蓝光的不良趋势造成的。 4.2 使用模拟长期建立的视觉比较方法的刻度，可以对透明液体的吸光黄色或褐色污染物进行评级。

1.1 This test method covers an instrumental method for the CIE (Commission International de l’Eclairage) tristimulus measurement of the color of near-clear liquid samples. The transmission measurement values are converted to the color scale in the platinum-cobalt (Pt-Co) system. 1.2 This test method has been found applicable to the color measurement of clear, liquid samples, free of haze, with nominal Pt-Co color values in the 0 to 100 range. It is applicable to non-fluorescent liquids with light absorption characteristics similar to those of the Pt-Co color standard solutions. 1.3 The tristimulus colorimetry may be calculated from spectral measurements or be obtained directly from a colorimeter. Practice E1455 provides some guidance on colorimeters, while Test Methods D1686 and D2108 deal with the visual and instrumental measurement of near-clear liquids. 1.4 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded in accordance with the rounding off methods of Practice E29 . 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 The primary objective of Pt-Co color measurement, as defined in Test Method D8005 , is to rate specific materials for yellowness. This yellowness is frequently the result of the undesirable tendency of liquid hydrocarbons to absorb blue light due to contamination in processing, storage, or shipping. 4.2 Clear liquids can be rated for light absorbing yellowish or brownish contaminants using scales that simulate the long-established visual-comparison method.