This standard specifies the technical requirements, sampling methods, test methods, inspection rules and signs, Encasement, storage and transportation of dewaxed purple film, decolorized lac film and decolorized dewaxed lac film. The standard is applicable to purple film processed by solvent dewaxing and activated carbon decolorization to ensure that the mass of the product meets the needs of industrial applications. The standard provides a technical basis for the production and quality control of lac film. It is widely used in the manufacture and testing of related products to ensure its effective application in the fields of paint, food and medicine.