Lub hom phiaj tseem ceeb ntawm tshuaj dawb yog ua kom cov pigment molecules nyob rau hauv textile fibers, yog li muab textile khoom ib tug dawb tsos. Kua txiv feem ntau yuav siv qhov chaw tom qab txhuam thiab feem ntau yog theem kawg ntawm kev kho mob ua ntej. Tom qab txhim kho, feem ntau ntawm cov impurities tau raug tshem tawm, dej nqus tau zoo heev, nrog rau cov neeg mob zoo rau tom ntej ua, tab sis cov pigment tsis tau kov, yog li cov ntau yam nrog siab whiteness yuav tsum tau bleached. Tshuaj tiv thaiv nws txawv raws li qhov khoom ntawm kev ua, xws li cov tshuaj fiber ntau, cov ntaub so ntswg thiab ntaub siv tshuaj dawb. Cov khoom siv thiab khoom siv tshuaj sib txawv yog txawv raws li qhov teeb meem no, tab sis cov ntsiab cai ntawm tshuaj dawb yog tib yam.
Nws tau raug qhia tias tshuaj dawb tau tuaj yeem ua si zoo rau kev tshem tawm cov khoom tsis muaj nqi los ntawm textiles. Qhov kub siab, alkaline mob thiab oxidation ntawm tshuaj muam tshuaj yog pab kom tshem tawm cov symbiotic impurity nyob rau hauv paj rwb fiber, yog li nws muaj cov nyhuv refining. Cov nyhuv ntawm bleaching yog txawv raws li cov khoom ntawm tshuaj ntxhuav thiab cov txheej txheem siv. Vim hais tias muaj cov ntsiab lus ntawm cov huab cua phem hauv paj rwb thiab cov khoom sib txawv thiab kev faib ntawm cov impurities, nws yog yuav luag tsis tas muab tshem tawm hauv kev kho kom zoo, yog li bleaching muaj cov hauj lwm ntawm ntxiv mus tshem tawm cov impurities.
