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This is a list of dyes with Colour Index International generic names and numbers and CAS Registry numbers. This list is incomplete ; you can help by adding missing items . ( January 2018 )
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A woman with dyed pink hair. Hair coloring, or hair dyeing, is the practice of changing the color of the hair on humans' heads.The main reasons for this are cosmetic: to cover gray or white hair, to alter hair to create a specific look, to change a color to suit preference or to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching.
A synthetic dye used to color hair blue was 1,4,5,8-tetraaminoanthraquinone prepared as Disperse Blue 1 with water and lignosulfonate dispersant. This is a semi-permanent dye as the dye molecules do not penetrate the hair shaft and so wash out in subsequent shampooing. It is not used in the U.S. as it is thought to be carcinogenic. [12]
Colorants (both dyes and pigments) are listed using a dual classification which use the Colour Index Generic Name (the prime identifier) and Colour Index Constitution Numbers. These numbers are prefixed with C.I. or CI, for example, C.I. Acid Orange 7 or C.I. 15510 .
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It is a red-pink dye used for food coloring, cosmetics, hair coloring, pet products, and diverse industrial colorings. [ 2 ] [ 3 ] It is the disodium salt of 2,4,5,7-tetraiodo fluorescein . [ 2 ]
Dip dye began with a more extreme look that added neon colors to the end of the hair. Later people began to transition to colors that have a more natural look. For blondes, many recommend going up to four shades lighter than your natural color. Brunettes and darker hair colors have more of a variety of options to explore such as copper or red. [8]