This standard specifies the method of testing the heat resistance Stability of pigment pastes for tanning. The standard applies to pigment pastes for tanning. During the test, the pigment paste is first made into a paint film, and then heated at different temperatures for a certain period of time. After comparing the discoloration with the original, the heat resistance Stability of the pigment paste is assessed. In the test, an oven is required to control the temperature at (210 +/- 2) degrees Celsius, and a metal sheet is prepared. The thickness is between 0.1mm and 0.3mm, and the surface should be flat, such as aluminum foil. The testing steps include sampling, sample preparation, etc. The sampling and testing process should comply with the relevant technical general principles. In the preparation stage of the sample, it is necessary to take an appropriate amount of pigment paste and apply it to the sheet, and control its thickness and uniformity.