Colour Index International (CII) is a reference database jointly maintained by the Society of Dyers and Colourists and the American Association of Textile Chemists and Colorists.
[1] It currently contains over 27,000 individual products listed under 13,000 Colour Index Generic Names.
(This abbreviation is sometimes mistakenly thought to be CL, due to the font used to display it.)
[3] A detailed record of products available on the market is presented under each Colour Index reference.
For manufacturers and consumers, the availability of a standard classification system for pigments is helpful because it resolves conflicting historic, proprietary, and generic names that have been applied to colours.