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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.
A hot comb (also known as a straightening comb or pressing comb) is a metal comb that is used to straighten moderate or coarse hair and create a smoother hair texture. [1] A hot comb is heated and used to straighten the hair from the roots. It can be placed directly on the source of heat or it may be electrically heated. [2]
The application technique is similar to the Japanese Yuko System, in that the hair is heated with flat irons to bind the product into the hair cuticle. [ citation needed ] Depending on the treatment used, the customer may have to avoid washing, wetting, pinning or constraining the hair in any way (e.g. with hair clips, pony tails, or headbands ...
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In the 1970s, acid perms were invented. These ammonia-free acid perms, sometimes called buffered waves, use glyceryl monothioglycolate in the place of ammonia. Acid perms, or buffered wavers, are slower but gentler to the hair. Heat is usually added by placing the client under a dryer, after covering the wrapped head with a plastic cap.
CHI-California Healthcare Institute is a private, non-profit public policy research and advocacy organization, representing more than 250 universities, academic research centers, biotechnology, and medical device companies. [1] Founded in 1993, and based in La Jolla, California, CHI has offices in Washington, D.C., and Sacramento, California.