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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.
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.
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 .
The curl-perm process adds body and volume to flat or straight hair, giving it more volume and making it easier to style. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please ...
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]
Perms and relaxation using relaxer or thermal reconditioning involve chemical alteration of the internal structure of the hair in order to affect its curliness or straightness. Hair that has been subjected to the use of a permanent is weaker due to the application of chemicals, and should be treated gently and with greater care than hair that ...
"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 ...
Acidic drain cleaners usually contain sulfuric acid at a high concentration which turns a piece of pH paper red and chars it instantly. Apart from grease and hair, an acidic drain cleaner containing sulfuric acid can be also used to dissolve tissue paper inside water pipes. Acidic drain cleaners usually contain sulfuric acid at high ...