This standard specifies a method for determining the color of clear liquids by comparison with standard glass color scales. It is primarily applicable to materials such as drying oils, varnishes, fatty acids, and resin solutions. The standard explicitly requires users to possess normal color discrimination ability. The relevant testing instruments mainly include the Gardner colorimeter, which is a specialized visual colorimetric device using color comparison tubes. Additionally, automated testing equipment such as electronic colorimeters or fully automatic colorimeters are often used for such color determinations, as they can provide more objective and consistent color measurement results.