1.1 本试验方法描述了基本浅色液体颜色的视觉测量程序( 注1 ). 它仅适用于存在的颜色产生体具有与所用铂钴颜色标准几乎相同的光吸收特性的材料。 注1: 指南中给出了估算深色液体颜色的程序，描述了可溶性硝化纤维素基溶液的颜色 D365页 . 1.2 为了确定使用本试验方法的观察值或计算值是否符合相关规范，应将试验结果四舍五入到最后右侧的“最近单位”- 根据实践修约方法，用于表示规格极限的手写数字 E29年 . 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 有关具体危险信息，请参阅材料安全数据表。 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）。本标准的用户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。 有关具体的危险说明，请参阅第节 6. . 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 3.1 溶剂的颜色特性随其预期用途的不同而不同，可容忍的颜色量取决于所用材料的颜色特性。 今天市场上市场上可买到的油漆、清漆和油漆溶剂或稀释剂通常很少或没有颜色。此类材料中是否有颜色表明溶剂的精制程度或运输或储存容器的清洁度，或两者兼而有之。 （A） 这是指南中铂钴色10号 D365页 . 3.2 多年来，“水白色”一词被认为足以作为溶剂颜色的测量。 定义“水白色”的几种表达逐渐出现，显然需要更精确的颜色标准。这是在1952年通过测试方法实现的 D1209 使用铂钴标度。该试验方法类似于中给出的描述 水和废水检验的标准方法 4. 被许多人称为“APHA颜色”这些铂钴颜色标准的制备最初由A.Hazen在 美国化学杂志 5. 在其中，他将数字5（万分之一）分配给他的铂钴储备溶液。随后，美国公共卫生协会在其第一版（1905年）水检测标准方法中，使用完全相同浓度的试剂，指定了相同比例的颜色名称500（百万分之一）。由于颜色与重量关系不直接相关，因此未使用百万分率术语。 因此，建议不要使用不正确的术语“Hazen颜色”。此外，由于主要指水，“APHA颜色”一词是不可取的。有机液体颜色的推荐术语为“铂钴色，试验方法” D1209 .” 3.3 石油工业使用赛波特色度计测试方法 D156 用于测量和定义碳氢化合物溶剂的颜色；然而，这种颜色测量系统在石油工业之外并不常用。 据各种来源报道，Saybolt颜色 +25相当于铂钴体系中的25，或相当于溶解在1 L蒸馏水中的4.8至5.6 mg重铬酸钾质量产生的颜色。由于所比较的几种颜色系统的光谱特性不同，以及测量的主观方式，很难获得精确的等效性。

1.1 This test method describes a procedure for the visual measurement of the color of essentially light colored liquids ( Note 1 ). 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 color standards used. Note 1: A procedure for estimating color of darker liquids, described for soluble nitrocellulose base solutions, is given in Guide D365 . 1.2 For purposes of determining conformance of an observed or a calculated value using this test method to relevant specifications, test result(s) shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29 . 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 For specific hazard information, see the Material Safety Data Sheet. 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. For specific hazard statements see Section 6 . 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 ====== 3.1 The property of color of a solvent varies in importance with the application for which it is intended, the amount of color that can be tolerated being dependent on the color characteristics of the material in which it is used. The paint, varnish, and lacquer solvents, or diluents commercially available on today's market normally have little or no color. The presence or absence of color in such material is an indication of the degree of refinement to which the solvent has been subjected or of the cleanliness of the shipping or storage container in which it is handled, or both. (A) This is platinum-cobalt color No. 10 in Guide D365 . 3.2 For a number of years the term “water-white” was considered sufficient as a measurement of solvent color. Several expressions for defining “water-white” gradually appeared and it became evident that a more precise color standard was needed. This was accomplished in 1952 with the adoption of Test Method D1209 using the platinum-cobalt scale. This test method is similar to the description given in Standard Methods for the Examination of Water and Waste Water 4 and is referred to by many as “APHA Color.” The preparation of these platinum-cobalt color standards was originally described by A. Hazen in the American Chemical Journal 5 in which he assigned the number 5 (parts per ten thousand) to his platinum-cobalt stock solution. Subsequently, in their first edition (1905) of Standard Methods for the Examination of Water, the American Public Health Association, using exactly the same concentration of reagents, assigned the color designation 500 (parts per million) which is the same ratio. The parts per million nomenclature is not used since color is not referred directly to a weight relationship. It is therefore recommended that the incorrect term “Hazen Color” should not be used. Also, because it refers primarily to water, the term “APHA Color” is undesirable. The recommended nomenclature for referring to the color of organic liquids is “Platinum-Cobalt Color, Test Method D1209 .” 3.3 The petroleum industry uses the Saybolt colorimeter Test Method D156 for measuring and defining the color of hydrocarbon solvents; however, this system of color measurement is not commonly employed outside of the petroleum industry. It has been reported by various sources that a Saybolt color of +25 is equivalent to 25 in the platinum-cobalt system or to colors produced by masses of potassium dichromate ranging between 4.8 and 5.6 mg dissolved in 1 L of distilled water. Because of the differences in the spectral characteristics of the several color systems being compared and the subjective manner in which the measurements are made, exact equivalencies are difficult to obtain.