This standard specifies a general test method for determining the bleeding resistance of pigments by comparison with a standard sample. If the general method is not applicable to a particular product, a specific method should be specified. Reference documents include GB 9285 and GB/T 9761. Bleeding is defined as the phenomenon in which the migration of pigment Color in the lower paint film results in discoloration of the upper freshly applied paint film. Materials include samples, water sandpaper, black and white check charts, lacquer and white finish coating. Sampling is carried out in accordance with the provisions of GB 9285. Operational steps include the preparation of pigment dispersion tests using the methods specified in the product standard and comparison with the standard sample.