Ua ntej qhov tshwm sim ntawm perm nyob rau hauv lub xyoo pua nees nkaum, cov poj niam nrhiav kev txhim kho lawv cov tsos los ntawm shaping curls thiab curls nrog curlers. Qhov kev tawg tuaj rau xyoo 1905, thaum Nesser tau tsim ib lub cuab yeej rau kev ua plaub hau ntawm hom no. Nws muaj cov hlau rods, uas tus poj niam lub strands raug mob, kho nrog ib tug daws ntawm sodium hydroxide, tom qab uas cov "curlers" tau rhuab nrog ib tug tam sim no. Thawj qhov kev sim curling tsis yog ib txwm ua tiav, vim. feem ntau nrog los ntawm kev kub hnyiab ntawm daim tawv nqaij thiab tag nrho cov plaub hau puas. Thawj "tus neeg raug tsim txom" ntawm cov txheej txheem no yog cov curls ntawm K. Nesseser tus poj niam, uas nws tau kuaj xyuas cov haujlwm ntawm nws lub cuab yeej. Tej yam txawv hnub no.
Hnub no muaj ntau hom kev tso cai. Ntawm lawv, muaj kev ua haujlwm nyob rau hauv ib puag ncig acidic (cov curls ruaj khov yog tsim, tab sis cov nyhuv ntawm cov plaub hau muaj zog heev), alkaline (kwv yees li peb lub hlis, tsis ua mob rau curls), tsim cov plaub hau siv cov kev daws teeb meem nruab nrab (ntau heev. Cov nyhuv me me, waving zoo cuam tshuam rau cov plaub hau ntawm txhua qhov chaw).
Ntawm cov tshuaj perms, kev ua haujlwm ua haujlwm siv cov kua qaub los ntawm pawg thioglycolic sawv sib nrug. Nws tuaj yeem nqa tawm txawm tias cov plaub hau dyed, vim. kev npaj tsis pub dhau o ntawm cov strands, uas tso cai rau koj kom tswj tau lawv qhov zoo. Tsis tas li ntawd, perm raws li cov khoom lag luam amino acid muab cov txiaj ntsig zoo. Nws twb kho tau raug mob curls nyob rau hauv lub chav kawm ntawm tus txheej txheem. Nco ntsoov tias curls siv cov khoom muag tsis kav ntev thiab tsis haum rau cov plaub hau hnyav ntev, vim. curls nyob rau hauv cov ntaub ntawv no yuav intensive "tsim" nyob rau hauv tus kheej hnyav ntawm cov plaub hau.
Perm rau cov plaub hau nruab nrab yog xaiv raws li lawv tus mob thiab zoo. Yog tias lawv qhuav thiab tawv taub hau ua rau khaus, ces nws yog qhov zoo dua tsis txhob xaj cov tshuaj acid. Nrog ncaj thiab tawv plaub hau ntawm hom oriental, qhov kev xaiv alkaline yuav tsis ua haujlwm, vim. nws yuav kav ib hlis thiab ib nrab feem ntau.
Yuav ua li cas cov plaub hau yuav saib tom qab thov perms kuj nyob ntawm txoj kev winding. Nws tuaj yeem ua tiav rau hauv curls (lawv muab curls zoo ib yam li tej yam ntuj tso), rau hauv lub pigtail (koj tau txais wavy "mane"), rau hauv hairpin (curls yuav zoo li curving nab, haum rau luv luv thiab nruab nrab ntev). Kev dag los ntawm qeb ntawm "ntxaib" tuaj yeem ua rau muaj txiaj ntsig zoo, vim. ib feem ntawm qhov ntev yog mob horizontally, thiab ib feem - vertically. Rau cov plaub hau luv luv, tsis muaj zog, chemo tuaj yeem ua tiav ntawm cov hauv paus hniav kom nce ntim.
Large perm, yees duab uasnthuav tawm hauv tsab xov xwm, tuaj yeem siv cov curlers tshwj xeeb (Olivia Garden), uas, ua ke nrog kev npaj tshwj xeeb, muab cov curls nyuaj (rau cov plaub hau nruab nrab ntev). Nws kuj tseem tuaj yeem ua qauv zoo li siv wellformers, uas yog cov hnab yas uas curls curled los ntawm compression (tsawg kuj, cov plaub hau ntawm cov hauv paus hniav tseem ncaj).
