Txoj cai ntawm kev hloov xim thaum cov xim sib xyaw ua ke feem ntau ua raws li lub hauv paus ntsiab lus ntawm kev sib xyaw xim sib xyaw. Kev sib xyaw xim sib xyaw yog hais txog kev sib xyaw ntawm cov xim lossis cov khoom xim, uas yog tus cwj pwm los ntawm qhov tseeb tias ntau cov xim sib xyaw, qhov ci ntawm cov xim yuav qis dua. Qhov no yog vim tias thaum cov xim sib xyaw, txhua cov xim absorbs ib feem ntawm lub teeb nthwv dej, ua rau cov xim sib xyaw ua kom tsaus.
Tshwj xeeb, thaum ob lossis ntau cov pigments sib xyaw, lub teeb nthwv dej absorbed los ntawm txhua tus ntawm lawv yog superimposed, yog li txo qhov ci ntawm lub teeb pom kev. Piv txwv li, thaum cov xim liab thiab xiav sib xyaw, cov xim sib xyaw yuav tsaus dua li siv cov xim ib leeg. Qhov no yog vim cov xim liab nqus tag nrho lub teeb tsis tsuas yog liab, thaum xiav pigments nqus tag nrho lub teeb tsis tsuas yog xiav. Tom qab ob qho tib si sib xyaw, qhov ntau ntawm cov teeb pom kev zoo yog qhov dav dua, yog li tsawg dua lub teeb tsis pom kev, thiab xim yog tsaus dua.
Tsis tas li ntawd, kev hloov xim tshwm sim thaum cov xim sib xyaw. Qhov no yog vim hais tias cov xim ntawm cov xim sib txawv muaj qhov sib txawv thiab qhov sib txawv, uas yuav ua rau cov xim sib xyaw ua rau muaj kev sib txawv ntawm qee yam xim. Piv txwv li, thaum cov xim daj thiab xiav xim sib xyaw, cov xim sib xyaw tuaj yeem sib txawv ntawm ntsuab lossis grey, nyob ntawm qhov kev faib ua feem ntawm ob qho xim thiab txoj kev sib xyaw.
Feem ntau, txoj cai ntawm kev hloov xim thaum pigments sib xyaw yog complex thiab cuam tshuam los ntawm ntau yam, nrog rau hom, kev faib ua feem, thiab kev sib xyaw ntawm cov xim. Kev nkag siab txog cov kev cai lij choj no tseem ceeb heev rau thaj chaw xws li kev tsim duab kos duab thiab tsim kev lag luam.