BS EN 13523-23-2002 "Coil-coated metals. Test method, chromadizing Stability in a humid atmosphere containing sulfur dioxide", focusing on the color stability performance testing of coil-coated metal-organic coatings under specific environments. The standard specifies the test principle, specimen preparation, test procedure, detailed setting of environment parameters containing sulfur dioxide in a humid atmosphere, clear evaluation methods and determination criteria for Color change, and provides a unified technical standard for scientifically evaluating the Color durability of coil-coated metals in corrosion environments.