Colour Index

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A numerical listing of colorants published by the Society of Dyers and Colourists in England. Initially published in 1924, each unique colorant is 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.

Synonyms and Related Terms

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

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