JIS K5101-18-2004 "Pigment Test Methods, Part 18: Hydration Resistance to Extractability", specifies the test method for the hydration resistance of pigments to extractability. The standard specifies the test principle, standardizes the sample preparation, hydration extraction operation process, and the evaluation method of pigment performance changes after extraction. It provides a unified standard for judging the pigment Stability in the hydration extraction environment, and helps to evaluate the pigment mass and ensure its Reliability in relevant application scenarios.