JIS K5101-17-2-2004 "Pigment test methods - Part 17: ph value. Section 2 Extraction at room temperature", specifies the determination method of the pH value of the pigment extract at room temperature. The standard details the sample preparation, extraction process, ph value measuring instrument requirements and operation steps, clarifies the data processing and result determination rules, and provides technical specifications for the accurate determination of the acid alkalinity of pigments under normal temperature extraction conditions, which helps to control the quality and application suitability of pigments.