1.1 本试验方法涵盖了各种石油产品颜色的目视测定，如润滑油、加热油、柴油和石油蜡。 注1: 试验方法 D156 适用于具有比0.5浅的ASTM颜色的精制产品。 注2: 一些染色产品的颜色可能超出测试程序中使用的玻璃参考标准所定义的颜色范围。此外，用于确定精度和偏差的样品不包括染色产品。 注3: 由用户决定该测试方法是否适用于其染色产品。 1.2 本试验方法报告特定于试验方法的结果，并记录为“ASTM颜色”。 ” 1.3 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。 1.4 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 石油产品颜色的测定主要用于制造控制目的，是一个重要的质量特征，因为产品的使用者很容易观察到颜色。 在某些情况下，颜色可以用作材料精细化程度的指示。当特定产品的颜色范围已知时，在确定范围之外的变化可能表明可能被另一种产品污染。然而，颜色并不总是产品质量的可靠指南，不应在产品规范中乱用。

1.1 This test method covers the visual determination of the color of a wide variety of petroleum products, such as lubricating oils, heating oils, diesel fuel oils, and petroleum waxes. Note 1: Test Method D156 is applicable to refined products that have an ASTM color lighter than 0.5. Note 2: The color of some dyed products may extend outside color range defined by the glass reference standards employed in the testing procedure. Furthermore, samples used to determine the precision and bias did not include dyed products. Note 3: It is up to the user to determine the suitability of this test method for their dyed products. 1.2 This test method reports results specific to the test method and recorded as “ASTM Color.” 1.3 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. 1.4 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 Determination of the color of petroleum products is used mainly for manufacturing control purposes and is an important quality characteristic, since color is readily observed by the user of the product. In some cases, the color may serve as an indication of the degree of refinement of the material. When the color range of a particular product is known, a variation outside the established range may indicate possible contamination with another product. However, color is not always a reliable guide to product quality and should not be used indiscriminately in product specifications.