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2. Synthetic colorant - Wikipedia

   en.wikipedia.org/wiki/Synthetic_colorant

   Synthetic colorants are those created in a laboratory or industrial setting. The production and improvement of colorants was a driver of the early synthetic chemical industry, in fact many of today's largest chemical producers started as dye-works in the late 19th or early 20th centuries, including Bayer AG (1863). [ 2 ]

3. Hair coloring - Wikipedia

   en.wikipedia.org/wiki/Hair_coloring

   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.

4. Tartrazine - Wikipedia

   en.wikipedia.org/wiki/Tartrazine

   Tartrazine is a commonly used coloring agent all over the world, mainly for yellow, and can also be used with brilliant blue FCF (FD&C Blue 1, E133) or green S (E142) to produce various green shades. It serves as a dye for wool and silks, a colorant in food, drugs and cosmetics and an adsorption-elution indicator for chloride estimations in ...

5. List of dyes - Wikipedia

   en.wikipedia.org/wiki/List_of_dyes

   Acid green 50 Food green 4 44090 triarylmethane 3087-16-9: Guinea green B Guinea green Acid green 3 Food green 1 42085 triarylmethane 4680-78-8: Hematoxylin/Hematein: Natural black 1 75290 natural 517-28-2: Hofmann's Violet Dahlia Primula 42530 triarylmethane 8004-86-2: Hydroxynaphthol blue: azo 63451-35-4: Indigo: Indigo blue Vat blue 1 73000 ...

6. Green pigments - Wikipedia

   en.wikipedia.org/wiki/Green_pigments

   Emerald Green, also known as Paris Green, Scheele's Green, Schweinfurt green and Vienna Green, is a synthetic inorganic compound, made by a reaction of sodium arsenite with copper(II) acetate. While it makes a beautiful rich green, the color of the emerald stone, it is highly toxic , due to a main ingredient, arsenic . [ 17 ]

7. Human hair color - Wikipedia

   en.wikipedia.org/wiki/Human_hair_color

   Permanent hair color means that the hair's structure has been chemically altered until it is eventually cut away. This does not mean that the synthetic color will remain permanently. During the process, the natural color is removed, one or more shades, and synthetic color has been put in its place. All pigments wash out of the cuticle.