Difference between revisions of "Colour Index"

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== Description ==
 
== 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.
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Initially published in 1924 by the Society of Dyers and Colourists in England, this widely acclaimed system enabled each commercial colorant to be assigned a name and number according to its composition, chemical class and shade.  Two formats, the Colour Index™ Generic Names (CIGN) and Colour Index™Constitution Numbers (CICN), are used for each colorant. For example, cobalt yellow is CI Pigment Yellow 40 and CI Number 77357.  
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:
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Any manufacturer of a dye, or pigment can register their product. To date, over 27,000 individual products have been registered under 13,000 Colour Index references. Each product name is listed the manufacturer, physical form, principal usages and comments supplied by the manufacturer to guide prospective customers. The C.I. Generic Name defines the essential colorant 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. The Colour Index generic name relates to the application of the colorant; for example, P stands for pigment, along with a description of the hue, such as Y for yellow or R for red followed by a sequential number. Examples include:
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* Cobalt yellow (as above): CI Pigment Yellow 40, or PY40
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* Hansa Yellow G: PY1
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* Orthonitroaniline Orange: PO2.
  
Part 1 covers pigments and solvent dyes, widely used in the paint, plastics, ink and other coloration industries.
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The Colour Index Constitution Number indicates the chemical classification of the pigment or dye, as series of numbers have been assigned to particular colorants that are chemically related. For example:
 
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* Monoazo colorants have Colour Index numbers between 11000 and 19999
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.
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* Disazo colorants have Colour Index numbers between 2oooo and 29999
 
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* Trisazo colorants have Colour Index numbers between 3oooo and 34999
You can subscribe to Part 1, Part 2 or the Full Edition (Parts 1 and 2).
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* Polyazo colorants have Colour Index numbers between 35ooo and 36999
 
 
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
 
  
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Commercial colorant tradenames on tubes, bottles and cans of colorants can be arbitrary or vague, but current ASTM protocols in the U.S. require that all containers as well as their technical sheets provide the precise identify of the colorant.  This is usually done by listing its CIGN.
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==

Revision as of 10:00, 24 May 2025

Description

Initially published in 1924 by the Society of Dyers and Colourists in England, this widely acclaimed system enabled each commercial colorant to be assigned a name and number according to its composition, chemical class and shade. Two formats, the Colour Index™ Generic Names (CIGN) and Colour Index™Constitution Numbers (CICN), are used for each colorant. For example, cobalt yellow is CI Pigment Yellow 40 and CI Number 77357.

Any manufacturer of a dye, or pigment can register their product. To date, over 27,000 individual products have been registered under 13,000 Colour Index references. Each product name is listed the manufacturer, physical form, principal usages and comments supplied by the manufacturer to guide prospective customers. The C.I. Generic Name defines the essential colorant 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. The Colour Index generic name relates to the application of the colorant; for example, P stands for pigment, along with a description of the hue, such as Y for yellow or R for red followed by a sequential number. Examples include:

  • Cobalt yellow (as above): CI Pigment Yellow 40, or PY40
  • Hansa Yellow G: PY1
  • Orthonitroaniline Orange: PO2.

The Colour Index Constitution Number indicates the chemical classification of the pigment or dye, as series of numbers have been assigned to particular colorants that are chemically related. For example:

  • Monoazo colorants have Colour Index numbers between 11000 and 19999
  • Disazo colorants have Colour Index numbers between 2oooo and 29999
  • Trisazo colorants have Colour Index numbers between 3oooo and 34999
  • Polyazo colorants have Colour Index numbers between 35ooo and 36999

Commercial colorant tradenames on tubes, bottles and cans of colorants can be arbitrary or vague, but current ASTM protocols in the U.S. require that all containers as well as their technical sheets provide the precise identify of the colorant. This is usually done by listing its CIGN.

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.

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