The ISO 591-1:2000 standard specifies specifications and test methods for titanium dioxide pigments for Coatings. The standard covers the main requirements of titanium dioxide pigments, including their chemical properties, physical properties and their application performance in Coatings. ISO 591-1:2000 introduces new assay methods, such as the Nakazono reductant method, and provides corresponding test standards to ensure the conformity and mass of titanium dioxide pigments. The implementation of this standard will help to improve the performance of Coatings products and ensure quality control in the Coatings industry.