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The chemical solution used in the perming process is determined by the client's hair type and the pH of the solution. Classic alkaline perms are used for stronger, coarser hair. They work at room temperature and usually contain ammonium thioglycolate in the pH range of 9-10. Acid perms are used on more delicate or thinner hair.
The curl-perm process adds body and volume to flat or straight hair, giving it more volume and making it easier to style. More specifically, it depends on your hair texture and what you’ve done ...
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.
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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]
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Dread perming is a chemical treatment that is used both by beauty salons and do-it-yourselfers to create or maintain dreadlocks. The hair is exposed to chemicals that render the hair frizzy . The frizzy hair is bound together and treated again to form the dreadlocks.
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