1.1本试验方法包括使用符合试验方法规定要求的任何分光光度计测量有釉或无釉瓷砖之间的光反射值（LRV）和视觉小色差。LRV和色差的大小和方向用数字表示，具有足够的精度，可用于产品规范。 1.2可以测量纯色瓷砖或具有多色、斑点或纹理表面的瓷砖的LRV。对于非实心瓷砖- 如本试验方法9.2所述，应从代表整个样品的图案中进行的多次测量中获得平均读数。瓷砖之间的小色差只能测量纯色瓷砖。具有多色、斑点或纹理表面的瓷砖之间的微小色差无效。 1.3对于纯色瓷砖，应在白炽灯、荧光灯和日光照明条件下对试样和参考试样进行比较。当被比较的瓷砖是异聚物时，使用多个光源可以进行色差测量，而不存在错误接受匹配的风险。 （见3.1.4。） 1.4以英寸-磅为单位的数值应视为标准值。括号中给出的值仅供参考。 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和健康实践，并确定监管限制的适用性。

1.1 This test method covers the measurement of Light Reflectance Value (LRV) and visually small color difference between pieces of glazed or unglazed ceramic tile, using any spectrophotometer that meets the requirements specified in the test method. LRV and the magnitude and direction of the color difference are expressed numerically, with sufficient accuracy for use in product specification. 1.2 LRV may be measured for either solid-colored tile or tile having a multicolored, speckled, or textured surface. For tile that are not solid-colored, an average reading should be obtained from multiple measurements taken in a pattern representative of the overall sample as described in 9.2 of this test method. Small color difference between tiles should only be measured for solid-color tiles. Small color difference between tile that have a multicolored, speckled, or textured surface, are not valid. 1.3 For solid colored tile, a comparison of the test specimen and reference specimen should be made under incandescent, fluorescent and daylight illuminant conditions. The use of multiple illuminants allows the color difference measurement to be made without the risk of wrongly accepting a match when the tiles being compared are metamers. (See 3.1.4.) 1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use.