Colour Index™ International (CI) is a reference database jointly maintained by SDC Enterprises and the American Association of Textile Chemists and Colorists. It currently contains over 27,000 individual products listed under 13,000 Colour Index™ Generic Names. It was first printed in 1924 but is now published solely on the Internet. The index serves as a common reference database of manufactured colour products and is used by manufacturers and consumers, such as artists and decorators.