1.1本术语标准定义了外观描述中使用的术语，包括但不限于颜色、光泽、不透明度、散射、纹理和材料（普通、荧光、反光）和光源（包括视觉显示单元）的可见性。 1.2 ASTM E12委员会关于外观的政策是，本术语标准包括明确适用于范围的重要术语和定义，无论这些术语目前是否在ASTM标准中使用。常用术语，出现在通用语言词典中（参见参考文献 (1-4) )通常不包括，除非字典显示了多个定义，并且似乎需要指示E12标准建议的定义。 1.3描述外观的术语用法差别很大。 在某些情况下，人们注意到一个术语在不同领域的不同用法。

1.1 This terminology standard defines terms used in the description of appearance, including but not limited to color, gloss, opacity, scattering, texture, and visibility of both materials (ordinary, fluorescent, retroreflective) and light sources (including visual display units). 1.2 It is the policy of ASTM Committee E12 on Appearance that this terminology standard include important terms and definitions explicit to the scope, whether or not the terms are currently used in an ASTM standard. Terms that are in common use and appear in common-language dictionaries (see Refs (1-4) ) are generally not included, except when the dictionaries show multiple definitions and it seems desirable to indicate the definitions recommended for E12 standards. 1.3 The usage of terms describing appearance varies considerably. In some cases, different usage of a term in different fields has been noted.