The ASTM D2244 test method is the standard practice of determining color tolerances and differences within a sample. During the procedure, experts use a colorimetric spectrometer to evaluate the difference in color between the sample and a reference. The spectrometer expresses the color value on the L, a, b, x, y, and z scales. Each letter represents a different scale and provides a precise evaluation of the sample’s color. This application is applicable to various materials including painted panels, plastics, and textiles and is often conducted in conjunction with accelerated aging tests involving cyclic, UV, xenon, and cyclic corrosion exposure.