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The thioglycolic acid in the perm solution reduces the disulfide cystine bonds in the cortex of the hair. [2] In a sense, the thioglycolate removes crosslinks. After washing, the hair is treated with a mild solution of hydrogen peroxide , which oxidizes the cysteines back to cystine .
Another type of "no-lye" relaxer uses ammonium thioglycolate, which is also known as perm salt for its use in permanent waves. Perm salt is a chemical reducing agent which selectively weakens the hair's cystine bonds instead of disrupting the entire protein, but strips out the natural oils even more thoroughly than the alkali hydroxide products.
A permanent wave, commonly called a perm or permanent (sometimes called a "curly perm" to distinguish it from a "straight perm"), [1] is a hairstyle consisting of waves or curls set into the hair. The curls may last a number of months, hence the name. Perms may be applied using thermal or chemical means.
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Chemical depilatories are indicated in the treatment of hirsutism in polycystic ovary syndrome. Depilatory ointments, or plasters, were known to Greek and Roman authors as psilothrum. [3] In Jewish lore, King Solomon is said to have discovered a chemical depilatory made from a mixture of lime and water and orpiment (arsenic trisulfide). [4]
"Perming" is time and labor-intensive, and expensive to maintain. The chemicals required for the process often cause the wearer's natural hair to become brittle and dry. To maintain the look of the Jheri curl, wearers are required to apply a curl activator spray and moisturizers daily, and sleep with a plastic cap over the hair to prevent it ...
Conk hairstyle. The conk was a hairstyle popular among African-American men from the 1920s up to the early-to-mid 1960s. [1] This hairstyle called for a man with naturally "kinky" hair to have it chemically straightened using a relaxer called congolene, an initially homemade hair straightener gel made from the extremely corrosive chemical lye which was often mixed with eggs and potatoes.
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