The ASTM D1210-1996 standard specifies a method for determining the degree of dispersion of pigments in pigment-paint systems and is primarily used to evaluate particle fineness and cleanliness. The method uses wedge and stepped Fineness Gauge to determine dispersion effectiveness and cleanliness by observing and counting particles in the tank. This standard helps evaluate whether pigments are sufficiently dispersed to affect the flatness and mass of the film. Readings for fineness are based on standard drawings and cleanliness grades, providing accurate particle distribution and impurity assessments.