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Early hair tongs. A hair iron is a tool used to change the structure of the hair with the help of heat. There are three general kinds: curling tongs, also known as curling irons, [2] used to make the hair curly; straighteners, also known as flat irons, [3] used to straighten the hair; and crimpers, [4] used to create small crimps in the hair.
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A hair roller or hair curler is a small tube that is rolled into a person's hair in order to curl it, or to straighten curly hair, making a new hairstyle. [1] The diameter of a roller varies from approximately 0.8 inches (20 mm) to 1.5 inches (38 mm). The hair is heated, and the rollers strain and break the hydrogen bonds [citation needed] of ...
The heat was controlled according to the type of hair by a thermostat control. In 1938, Arnold F. Willatt invented the cold wave, the precursor to the modern perm. [12] It used no machines and no heat. The hair was wrapped on rods and a reduction lotion containing ammonium thioglycolate was applied. This chemical breaks open the disulfide ...