This standard provides methods for the determination of soluble sulfates, chlorides and nitrates in pigments in water. Testing involves the use of reagents such as muriatic acid, silver nitrate (AgNO3), ammonium chloride, etc., to ensure accurate determination of water-soluble ions in pigments. If the standard method is suitable for a pigment, it should be noted in the product standard and adjusted as needed; if not, a special method needs to be developed. This standard helps to unify the determination method and ensure the accuracy and conformity of the determination results.