Hair coloring
Hair coloring or hair dyeing is changing the color of hair. Common reasons are to cover gray hair, to change to a color that a person likes better, and to return the hair to its normal color after it has been badly changed by hairdressing or sun bleaching. The 1661 book Eighteen Books of the Secrets of Art & Nature explained ways of coloring hair black, gold, green, red, yellow, and white .[1]
Types of hair coloring
The four common types of hair coloring are permanent, demi-permanent (sometimes called deposit only), semi-permanent, and temporary.[2]
Hair Coloring Media
Lafayette in 1830, aged 73, with pitch-black hair (painting by Louise-Adéone Drölling).
Hair with blonde highlights
Shelf with a great number of different hair colours, each having a colour code printed on the packaging, at a hairdresser in Germany
A person with their hair colored light blue and their beard colored dark blue
Actress Margot Robbie with bleached blond hair
Couplers are chemical compounds that define the color of the hair dye. Shown here are three red couplers (A, B, C), two yellow-green couplers (D, E) and a blue coupler (F).
first reaction in typical hair dyes
second reaction in typical hair dying
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References
- ↑ Wecker, Johann Jacob; R. Read (1661). Eighteen books of the secrets of art & nature. p. 83.
- ↑ “Hair Preparations,” Ullmann’s Encyclopedia of Industrial Chemistry. Wiley-VCH, Weinheim (2006).
