This standard is used to evaluate the patching performance of architectural coatings under various drying conditions. It describes how to test the Color and Gloss retouching ability of Coatings under laboratory conditions, and the effect of different drying conditions on Coatings Appearance. This method is particularly suitable for analyzing how Coatings maintain a consistent Appearance in different drying environments, helping to ensure Coatings' aesthetics and durability in practical applications. The standard provides Coatings manufacturers and contractors with a reliable tool to evaluate and improve Coatings performance.