The ASTM D5067-16 (2021) Standard Specification for Artist Watercolor Pigments provides clear technical requirements for the production and quality control of artist watercolor pigments. The standard specifies the composition, physical properties, and performance of watercolor pigments, including important indicators such as Color Strength, Transparency, Color Persistence, and Dispersion. The standard requires watercolor pigments to have performance suitable for artistic creation and to ensure their safety, Stability, and environment friendliness. In addition, the standard also covers specifications for pigment Encasement, Labeling, and Storage to help manufacturers produce products that meet mass requirements. This specification provides a reliable watercolor pigment mass guarantee for artists, as well as a reference for suppliers and mass regulators.