ASTM D1729-22 Diffusely-Illuminated Standard Practice for Visual Evaluation of Color and color difference of opaque materials provides a standardized method for evaluating the Color and color difference of opaque materials under diffuse light conditions. The standard is widely used in quality control and product development in the Coating, Plastic, Spinning & Weaving industries through visual sensory assessment to help testers accurately determine the conformity and difference of materials under appropriate Light sources. The standard details the experimental environment setting, viewing angle, Illumination conditions, and the selection of evaluators to ensure that the evaluation results have high conformity and Reliability. This method is suitable for non-instrumented Color evaluation, emphasizing the subjectivity of Color evaluation and the importance of environment control.