Hair Coloring
Hair coloring
Definition of hair coloring: Hair coloring is the practice of changing the color of hair. The main reason for this practice are cosmetic, e.g. to cover gray hair, to change to a color regarded as more fashionable or desirable, and to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching. Hair dying, which is an ancient art, involves treatment of the hair with various chemical compounds. Today, hair coloring is immensely popular, with over 75 percent of American women dyeing their hairHistory History: The dyeing of hair is an ancient art. In ancient times, the dyes were obtained from plants.[ Some of the most well known are henna (Lawsonia inermis), indigo, Cassia obovata, senna, turmeric and amla. Others include katam, black walnut hulls, red ochre and leeks.[16] In the 1661 book Eighteen Books of the Secrets of Art & Nature, various methods of coloring hair black, gold, green, red, yellow, and white are explained. The development of synthetic dyes for hair is traced to the 1860s discovery of the reactivity of PPD with air.Hair dyeing is now a multibillion dollar industry that involves the use of both plant-derived and synthetic dyes Types of hair coloring: Permanent hair color: A popular way to achieve permanent hair coloring is through the use of oxidation dyes. The ingredients of these products include 1,4-diaminobenzene (historically) or 2,5-diaminotoluene (currently), a coupling agent, and an oxidant. The process is typically performed under basic conditions. The mechanism of oxidation dyes involves three steps: 1) Oxidation of 1,4-diaminobenzene derivative to the quinone state. 2) Reaction of this diimine with a coupler (more detail below). 3) Oxidation of the resulting compound to give the final dye Semi-permanent hair dye: Semi-permanent hair color has smaller molecules than temporary dyes. These dyes only partially penetrate
Definition of hair coloring: Hair coloring is the practice of changing the color of hair. The main reason for this practice are cosmetic, e.g. to cover gray hair, to change to a color regarded as more fashionable or desirable, and to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching. Hair dying, which is an ancient art, involves treatment of the hair with various chemical compounds. Today, hair coloring is immensely popular, with over 75 percent of American women dyeing their hairHistory History: The dyeing of hair is an ancient art. In ancient times, the dyes were obtained from plants.[ Some of the most well known are henna (Lawsonia inermis), indigo, Cassia obovata, senna, turmeric and amla. Others include katam, black walnut hulls, red ochre and leeks.[16] In the 1661 book Eighteen Books of the Secrets of Art & Nature, various methods of coloring hair black, gold, green, red, yellow, and white are explained. The development of synthetic dyes for hair is traced to the 1860s discovery of the reactivity of PPD with air.Hair dyeing is now a multibillion dollar industry that involves the use of both plant-derived and synthetic dyes Types of hair coloring: Permanent hair color: A popular way to achieve permanent hair coloring is through the use of oxidation dyes. The ingredients of these products include 1,4-diaminobenzene (historically) or 2,5-diaminotoluene (currently), a coupling agent, and an oxidant. The process is typically performed under basic conditions. The mechanism of oxidation dyes involves three steps: 1) Oxidation of 1,4-diaminobenzene derivative to the quinone state. 2) Reaction of this diimine with a coupler (more detail below). 3) Oxidation of the resulting compound to give the final dye Semi-permanent hair dye: Semi-permanent hair color has smaller molecules than temporary dyes. These dyes only partially penetrate