1.1 本试验方法涵盖了近透明液体颜色的目视测量程序。它仅适用于其中存在的颜色产生体具有与所使用的铂钴（Pt-Co）颜色标准的光吸收特性几乎相同的光吸收特征的材料。 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色值在0和100之间。它适用于具有类似于Pt-Co颜色标准溶液的光吸收特性的非荧光液体。试验方法 209天 ， 686美元 和 第5386页 处理近透明液体的视觉和仪器测量。 1.3 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 第29页 。 1.4 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.5 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。 1.6 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 视觉Pt-Co颜色测量方法的主要目的是对特定材料的黄度进行评级。 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。

1.1 This test method covers a procedure for the visual measurement of the color of near clear liquids. It is applicable only to materials in which the color-producing bodies present have light absorption characteristics nearly identical with those of the Platinum-Cobalt (Pt-Co) color standards used. 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 between 0 and 100. It is applicable to nonfluorescent liquids with light absorption characteristics similar to those of the Pt-Co color standard solutions. Test Methods D1209 , D1686 , and D5386 deal with the visual and instrumental measurement of near-clear liquids. 1.3 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 . 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 major objective of the visual Pt-Co method of color measurement is to rate specific materials for yellowness. The yellowness is frequently the result of the undesirable tendency of liquid hydrocarbons to absorb blue light due to contamination in processing, storage, or shipping.