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Hair straightening is a hair styling technique used since the 1890s involving the flattening and straightening of hair in order to give it a smooth, streamlined, and sleek appearance. [1] It became very popular during the 1950s among black males and females of all races.
Perms may be applied using thermal or chemical means. In the latter method, chemicals are applied to the hair, which is then wrapped around forms to produce waves and curls. The same process is used for chemical straightening or relaxing, with the hair being flattened instead of curled during the chemical reaction.
Women straightened their hair through chemical straightening processes, by ironing their hair at home with a clothes iron, or by rolling it up with large empty soda cans while wet. [32] Bantu Knots Woman wearing a loose Afro. Since the 1960s and 1970s, women have worn their hair in a wide variety of styles.
The Chemical Abstracts Service (CAS) [13] lists formaldehyde (50-00-0 [14]) and methylene glycol (463-57-0 [15]) as two different substances. The compounds have two different chemical structures, exist in two different chemical families and exhibit different physical properties. Formaldehyde is a colorless gas with chemical structure HCHO.
The question now becomes what counts as too close a copy to be allowed and whether a small alteration is really different — some entities might try to add vitamin B12 to their drugs or deliver ...
Hair care in Tianjin, China, in late Qing dynasty . Hair care or haircare is an overall term for hygiene and cosmetology involving the hair which grows from the human scalp, and to a lesser extent facial, pubic and other body hair.
Cosmetology (from Greek κοσμητικός, kosmētikos, "beautifying"; [1] and -λογία, -logia) is the study and application of beauty treatment.Branches of specialty include hairstyling, skin care, cosmetics, manicures/pedicures, non-permanent hair removal such as waxing and sugaring, and permanent hair removal processes such as electrology and intense pulsed light (IPL).
The scalp can suffer severe chemical burns if over exposed to lye or no-lye relaxers. A lye relaxer consists of sodium hydroxide (also known as NaOH or lye) mixed with water, petroleum jelly, mineral oil, and emulsifiers to create a creamy consistency. On application, the caustic "lye cream" permeates the protein structure of the hair and ...
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