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Colour Index Numbers (CIN)

Pigments are given a color index number according to the chemical structure.
The table below shows the ranges and categorys.

Colour Index International is a reference database jointly maintained by the Society of Dyers and Colourists and the American Association of Textile Chemists and Colorists. It was first printed in 1925 but is now published exclusively on the web. The index serves as a common reference database of manufactured colour products and is used by manufacturers and consumers, such as artists and decorators.

Colorants (both dyes and pigments) are listed according to Colour Index Generic Names and Colour Index Constitution Numbers. These numbers are prefixed in Brazil and various other countries with C.I. or CI, for example, CI 15510. This abbreviation is sometimes thought to be CL, due to the font used to display the information. A detailed record of products available on the market is presented under each Colour Index reference. For each product name, Colour Index International lists the manufacturer, physical form, and principal uses, with comments supplied by the manufacturer to guide prospective customers.

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.
Explanation of the Colour Index Constitution Numbers can be found at the Colour- index.org site in PDF format.

Structure w/
Wikipedia Refs
Category w/
Wikipedia Refs
Nitroso Nitroso 10000-10299 -
Nitro Nitro 10300-10999 -
Azo Introduction;      
Monoazo Monoazo 11000-19999 Category: Azo dyes
Disazo Diazo 20000-29999 Category: Azo dyes
Trisazo   30000-30499  
Polyazo   35000-36999  
Azoic   37000-39999  
Stilbene Stilbene 40000-40799 -
Carotenoid Carotenoid 40800-40999  
Diphenylmethane Diarylmethane 41000-41999 Category: Diarylmethane dyes
Triarylmethane Triarylmethane 42000-44999 Category: Triarylmethane dyes
Xanthene Xanthene 45000-45999 -
Acridine Acridine 46000-46999 Category: Acridine dyes
Quinoline Quinoline 47000-47999 Category: Quinoline dyes
Methine and Polymethine Methine 48000-48999 -
Thiazole Thiazole 49000-49399 Category: Thiazole dyes
Indamine and Indophenol Indamine 49400-49699 -
  Indophenol 49700-49999 Category: Indophenol dyes
Azine Azine 50000-50999 Category:Azin dyes
Oxazine Oxazine 51000-51999 Category: Oxazin dyes
Thiazine Thiazine 52000-52999 Category: Thiazin dyes
Sulphur   53000-54999  
Lactone   55000-55999  
Ketone and Hydroxyketone Aminoketone 56000-56999 -
- Hydroxy ketone 57000-57999  
Anthraquinone Anthraquinone 58000-72999 Category: Anthraquinone dyes
Indigoid Indigoid 73000-73999 -
Phthalocyanine Phthalocyanine 74000-74999 Category: Phthalocyanines
Natural Organic Colour Matters   75000-75999  
Oxidation Bases   76000-76999  
Inorganic Colouring Matters Inorganic pigments 77000-77999 Category: Inorganic pigments
Intermediate Index      
Elementary Formula Index      

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Artist Reference Resources:

Natural Pigments, Pigments, Education, The Best source of Natural and Historical Pigments
Dick Blick Artist Supply:
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Handprint.com, Guide to Watercolor Pigments, Bruce MacEvoy 2008

Artist's Paint and Pigments Reference, Color Index Chemical Constitution Numbers