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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 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. Alternatively, a hair dryer heats the hair after the rolls are in place. Hair spray can temporarily fix curled hair in place.
In 1930, Solomon Harper created the first electrically-heated hair rollers, then creating a better design in 1953.
In 1968 at the feminist Miss America protest, protestors symbolically threw a number of feminine products into a "Freedom Trash Can." These included hair rollers, which were among items the protestors called "instruments of female torture" and accouterments of what they perceived to be enforced femininity. More recently, men are participating in the Curlers for Equality challenge, sleeping with rollers in their hair to experience what women go through for beauty, in order to create dialogue on ghe double standard of beauty and instead encourage body positivity.
Velcro hair roller
A Velcro hair roller is made of a strip of hook and loop fasteners that is wrapped around cylinders. They are available in different sizes and can be used on dry or wet hair. The rollers are self-holding because they do not need pins or clips to be held in place and do not need heat to be applied to create the curls. Typically kept in the hair for about fifteen minutes. To clean Velcro hair rollers hair should be removed from them and then soaked in shampoo and water mixture followed by a vinegar solution to remove any excess oil or dirt.
- Valenti, Lauren (October 17, 2015). "The Modern Way to Use Hair Curlers". Marie Claire. Hearst Communications. Retrieved 2 December 2017.
- Corporation, Conair. "How to Use Hot Rollers for Long Lasting Curls and Volume". Conair® Corporation. Retrieved 2018-05-07.
- Dow, Bonnie J. (Spring 2003). "Feminism, Miss America, and Media Mythology". Rhetoric & Public Affairs. 6 (1): 127–149. doi:10.1353/rap.2003.0028.
- Duffett, Judith (October 1968). WLM vs. Miss America. Voice of the Women's Liberation Movement. p. 4.
- "How To Properly Clean Your Hair Tools". Retrieved 2018-05-06.
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