Cov roj tseem ceeb feem ntau yog siv tom qab toners thiab ua ntej pleev thiab cream. Raws li cov kev cai dav dav ntawm daim ntawv thov ntawm daim tawv nqaij zoo nkauj los ntawm nyias mus rau tuab, daim ntawv thov cov kauj ruam ntawm cov roj tseem ceeb yog: toner → tseem ceeb roj → lotion / cream, → tshuaj pleev thaiv hnub. Cov roj tseem ceeb yog nyias hauv kev ntxhib los mos, thiab lawv muaj cov yam ntxwv ntawm cov molecules me me thiab muaj zog nkag mus, uas yooj yim rau nqus mus rau hauv daim tawv nqaij, thiab cov roj tseem ceeb tuaj yeem siv tom qab toner los ua kom lawv cov teebmeem. Cov khoom siv tu tawv nqaij xws li tshuaj pleev thiab tshuaj pleev ib ce feem ntau ntxiv nrog cov thickeners lossis lwm cov khoom xyaw polymer, uas muaj cov ntaub ntawv tuab, siab molecular hnyav, thiab tsis yooj yim rau absorbed, thiab tuaj yeem tsim cov yeeb yaj kiab tiv thaiv ntawm daim tawv nqaij tom qab ua. siv rau cov roj yam tseem ceeb los tiv thaiv kev poob ntawm cov as-ham thiab noo noo, thiab tseem tuaj yeem tiv thaiv cov kab mob sab nraud thiab cov pa phem los ntawm kev nkag mus rau ntawm daim tawv nqaij, kom cov tawv nqaij tu cov nyhuv ntawm cov roj tseem ceeb tuaj yeem khaws cia ntev dua.
