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Colour Index (CI)

The colour index (CI) number, developed by the Society of Dyers and Colorists, is used for dye classification. Once the chemical structure of a dye is known, a five-digit CI number assigned to it. The first word is the dye classification and other shade or hue of the dye. Such as CI Acid Yellow 36 (CI 13065) is a yellow dye of the acid type.

Furthermore, a dye mixture can include several dyes such as Navy 106 is composed of three reactive azo dyes: Remazol Red RB, Remazol Black B, and Remazol Golden Yellow 3. The society of colourist and dyers categorise substance and data supplied by various manufacturers. See Textile fabric dye overview


  • Substance form
  • Data from manufacturers
  • Category of use by branches
  • Main application (the type of fibres or fabric in case of textiles, and other industries depending on materials for example steel, paper)
  • The product status (of which withdrawn from production or other issues related environment etc.)
  • Hue Indication Chart (map)

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Sources and useful Information

  • Society of Dyers and Colourists (Great Britain) and the American Association of Textile Chemists and Colorists, which includes periodic additions and amendments.
  • Encyclopedic Dictionary of Polymers. Published 2007 by Springer Science+Business Media, LLC.

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