The ASTM E 2194-14 (2021) standard test method is used for multi-angle Color measurement of sheet metal chromadizing materials. This method evaluates the surface Optical inspection properties of sheet metal chromadizing materials by measuring the Color change of sheet metal chromadizing materials at different angles. Due to the Gloss and angle dependence of sheet metal coatings, traditional single-angle measurement cannot fully reflect its true Color performance, so multi-angle measurement can more accurately describe its color change under different lighting conditions. This standard is critical for industries such as Coatings, Automotive Appearance Design, and Decorative Materials, and helps manufacturers and suppliers ensure product conformity and quality control.