Welcome to the Colour Index Online

...the definitive guide for anyone who needs to know details of which companies manufacture and distribute dyes and pigments, or for everyone looking for technical details of these products.

First published in 1924, now published on the web by the Society of Dyers and Colourists and the American Association of Textile Chemists and Colorists, it is the only authoritative international reference work on these colorants: their nomenclature, constitution, main applications and suppliers.

Colorants are listed according to the widely acclaimed system of Colour Index Generic Names and Colour Index Constitution Numbers. A detailed record of products available on the market is presented under each Colour Index reference. Against each product name is listed the manufacturer, physical form, principal usages and comments supplied by the manufacturer to guide prospective customers.

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The media has recently reported vulnerability within the security of many websites. The Heartbleed bug leaves no traces that data has been exploited however the Colour Index does not use the affected version of OpenSSL. We would like to take the opportunity to remind our users that it is best practice to change your passwords frequently for maximum account protection.