Colour Index

Description

A numerical listing of colorants developed and published by the Society of Dyers and Colourists in England. Initially published in 1924, 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.this system enabled each commercial colorant to be assigned a name and number according to its composition, chemical class and shade. For example, cobalt yellow is CI Pigment Yellow 40 and CI Number 77357. any manufacturer of a dye, pigment or solvent dye to register their product. The C.I. Generic Name defines the essential colourant only. Commercial products listed under the same C.I. Generic Name may not have identical application, fastness or ecological properties; check with the supplier concerned.

It is published on the web in two parts as follows:

Part 1 covers pigments and solvent dyes, widely used in the paint, plastics, ink and other coloration industries.

Part 2 covers dye classes used in a very wide range of industries. The main dye classes are: acid, basic, direct, disperse, food, fluorescent brightener, mordant, reactive, sulphur and vat, plus several other classes of minor or historical importance.

You can subscribe to Part 1, Part 2 or the Full Edition (Parts 1 and 2).

Features: 27,000 individual products under 13,000 Colour Index™ Generic Names Popular format with unique 'fingerprint' concept Product listings, containing detailed information about individual products All Part 1 information confirmed with manufacturers and suppliers Part 2 information either confirmed with manufacturers and suppliers or marked as being carried over from the previous edition Chemical structures depicted according to results of recent research on molecular conformation As pigments are introduced to commerce/ they are assigned a Colour Indexs generic name ând number as well as a five-digiL Colour Index ntmber. The Colour Index generic name relates to the application o{ the colorant; for example, P stands for pigment, along with a description of the hue, such as Y for yellow or R {or red.6A sequential number, re{erred to as the generic number in the Colour Index, is also assigned to each colorant. For example, Hansa Yellow G is assigned the generic name and number PYr, while Orthonitroaniline Orange is assigned the name and number POz. The Colour Index number indicates the chemical classification of the pigment or dye, as series of numbers have been assigned to particular colorants that are chemically related. Monoazo pigments and dyes have Colour Index nurr,bers between rrooo and 19999, while disazo colorants have Colour Index numbers between 2oooo and 29999. Colour Index numbers between 3oooo and 34999, and 35ooo and 36999, have been assigned to trisazo and polyazo colorants, respectively. . A list oÍ Colour Index generic names corresponding to manufacturers' names can be found in the Colour Index. A comparative lightfastness rating of the products is generally given in the technical literature. l1 a paint bears the Colour Index numbers on the tube, it is possible to locate the properties of the material in the Colour Index or in handbooks such as Steven L. Saitzyk's Art Hardware, Míchael Wilcox's Wilcox Guide to the Best Watercolor Paints, and Mark David Gottsegen's Painter's Handbook.e

Synonyms and Related Terms

CI; Color Index; index de couleur (Fr.);

Resources and Citations

• Colour Index Generic Name: Definition Published online by Society of Dyers and Colourists and American Association of Textile Chemists and Colorists.
• Society of Dyers and Colourists, Colour Index, 3d ed. (Bradford, England, 1971),
• Ruth Johnston-Feller, "Standard Specifications of Pigment Composition and Color," in Artists' Pigments: A Handbook of Their History and Characteristics, ed. Robert L. Feller, vol. I (Washington, 1986l, 299-300.