HAIR DYE CHEMICAL COMPOSITION
The Chemistry of Permanent Hair Dyes – Compound Interest
The ammonia causes the cuticles of the hair to swell, which then allows the dye molecules to pass into the hair and induce permanent colouring. This process can, however, damage the hair, particularly if you frequently dye it. For this reason, many companies have produced ammonia-free hair dyes, using substitutes such as ethanolamine.
Hair coloring - Wikipedia
OverviewHistoryApplication techniquesTypesMaintaining hair colorAdverse effectsHair coloring, or hair dyeing, is the practice of changing the hair color. The main reasons for this are cosmetic: to cover gray or white hair, to change to a color regarded as more fashionable or desirable, or to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching. Hair coloring can be done professionally by a hairdresser or independently at home. Today, hair coloring is very popular, with 75% of women and 18% of men living in Copenhagen havinSee more on enpedia · Text under CC-BY-SA license
How hair dye is made - ingredients of, making, used, parts
BackgroundRaw MaterialsThe Manufacturing ProcessQuality ControlThe FutureHair dye is one of the oldest known beauty preparations, and was used by ancient cultures in many parts of the world. Records of ancient Egyptians, Greeks, Hebrews, Persians, Chinese, and early Hindu peoples all mention the use of hair colorings. Early hair dyes were made from plants, metallic compounds, or a mixture of the two. Rock alum, quicklime, and wood ash were used for bleaching hair in Roman times, and herbaSee more on madehow
Structure and chemical composition of hair
Structure and chemical composition of hair The hair on our bodies has a particular structure and is divided into thin and thick hair. Thin hair, also called lanugo or vellus, is located on all skin surfaces except for the palms of the hands and the soles of the feet.
EP0542129A1 - Hair dye composition - Google Patents
The hair dye composition contains as developer substance at least one triaminohydroxypyrimidine and/or diaminodihydroxypyrimidine and as coupler substance alone or mixed with other coupler substances 3-amino-2-methylamino-6-methoxypyridine or its salts. Use of this composition mixed with an oxidising agent results in dyeings with excellentCited by: 1336Publish Year: 2001Author: Kenzo Koike, Yoshinori Saito, Hiroshi Obata, Yukihiro Nakamura, Yoji Hata
EP1142560A2 - Hair dye composition - Google Patents
Provided is a hair dye composition comprising a first part containing an alkaline agent and a second part containing an oxidizing agent, wherein the first part contains (A) the alkaline agent, (B) a cationic direct dye, (C) a nonionic surfactant, (D) water, and (E) an anionic component selected from anionic surfactants and anionic polymers; and