GB/T 21868.6-2008 "Pigments and extenders—Methods of dispersion for assessment of dispersion characteristics—Part 6: Dispersion using a triple-roll mill" specifies the operational method for dispersing pigments using a triple-roll mill, which is suitable for high-viscosity pigment pastes and fine dispersion requirements. It defines parameters such as the pressure between the rollers of the triple-roll mill, the speed ratio, and the material feeding rate, achieving deep dispersion of pigments through the shearing action of multiple roller stages. Testing requires instruments such as a triple-roll mill, a fineness gauge, and a viscometer, providing technical support for the evaluation of dispersion characteristics in high-end pigment products.