This standard specifies equipment and procedures for the visual evaluation of Color and color differences of diffuse reflection opaque materials. The method evaluates the accuracy of Color matching based on observations under simulated daylight conditions. The standard emphasizes the importance of color vision and training of the observer and specifies requirements for evaluation equipment. Suitable for a wide range of Color evaluation applications in industry, including Color selection, production process monitoring and finished product inspection. Particularly suitable for scenarios where high-precision Color matching is required, such as Color conformity of materials and quality control.