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The hair is heated, and the rollers strain and break the hydrogen bonds [citation needed] of each hair's cortex, which causes the hair to curl. The hydrogen bonds reform after the hair is moistened. A hot roller or hot curler is designed to be heated in an electric chamber before one rolls it into the hair. [2] Alternatively, a hair dryer heats ...
Electrical hair-treating implement" patent filed by Solomon Harper in 1924 [2] Solomon Harper (born in Poplar Grove, Arkansas , on August 8, 1893 [ 3 ] ) was an electrical engineer and inventor [ 4 ] known for creating the first electrically heated hair roller [ 5 ] [ 6 ] [ 2 ] [ 7 ] and 28 other inventions.
The hair was wrapped in a spiral around rods connected to a machine with an electric heating device. Sodium hydroxide (caustic soda) was applied and the hair was heated to 212 °F (100 °C) or more for an extended period of time. The process used about twelve 2-pound (0.9 kg) brass rollers and took six hours to complete. These hot rollers were ...
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.
ABC News conducted an undercover study of hotel rooms ranging in price from $98 to $500 and found that the hair dryer was way dirtier than they would have guessed.
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