1.1 试验方法 D2616 描述了绘制的灰阶以及通过与该灰阶进行比较，对非自发光材料的色差进行视觉评估时使用的程序。本实践提供了一种通过工具方法获得类似值结果的替代方法。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他测量单位，但本试验方法的试验结果通过计算转换为试验方法定义的任意视觉比例 D2616 ，其单位称为GS C （颜色变化的灰度）。 1.3 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。 1.4 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====== 5.1 灰度等级GS C 有助于评估已接受测试的任何一对颜色的色差，其结果的严重性由已处理构件与未处理构件的色差指定。这包括但不限于擦洗试验、外部暴露、摩擦试验、堵塞试验、某些磨损试验和颜色转移试验。 5.2 获取灰度等级的仪器方法的一个主要优点是，在视觉方法下，需要对操作员进行大量的视觉颜色评估筛选和培训。 在这种仪器方法中，操作员不会承受这样的负担。 5.3 该方法通常不用于具有自己的染色灰度的染色测试。

1.1 Test Method D2616 describes a painted gray scale and the procedure to be used in the visual evaluation of color differences on non-self-luminous materials by comparison to this scale. This practice provides an alternative method of obtaining a similarly valued result by an instrumental method. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard, except that the test results of this test method are converted by the calculations to an arbitrary visual scale defined by Test Method D2616 , whose units are called GS C (Gray Scale for Change in 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 ====== 5.1 The gray scale grade GS C is useful to evaluate the color difference of any pair of colors that have been subjected to a test whose severity of result is nominated by color difference of the treated member to the untreated member. This includes, but is not limited to, scrub tests, exterior exposures, crocking tests, blocking tests, certain abrasion tests, and color transfer tests. 5.2 A major advantage of the instrumental method of obtaining gray scale grades is that under the visual method substantial screening and training of the operators in visual color assessment is required. No such burden is placed on the operators in this instrumental method. 5.3 The method is usually not used for staining tests which have their own gray scale for staining.