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3 Chemistry and CI Numbers
As dyes have complex chemical structures, their chemical names are difficult to understand and remember and common names are in the local languages and are area specific, a color index has been developed for identifying the dyes.
In the color index, dyes are classified according to major application classes.
Thus a dye has a CI constitution number assigned to its chemical constitution and also a name in the color index which denotes the type of dye.
For example, the CI number of natural indigo dye is 75780 with the name CI Natural Blue 1 in which CI denotes Color Index, Natural indicates type of dye, Blue indicates the hue, and 1 is the identi- fying number.
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