Kev tua phom
Kev siv xuab zeb tua hluav taws tuaj yeem tshem tawm cov xim, xeb, thiab cov seem ntawm kev oxidation ntawm cov ntaub ntawv sai thiab zoo. Kev siv xuab zeb tua hluav taws kuj tseem siv tau los hloov pauv qhov xwm txheej ntawm cov hlau nto, xws li los ntawm kev tshem tawm cov khawb lossis cov cim casting. Kev siv xuab zeb tua hluav taws ua ib txoj kev ntxuav tau siv dav rau ntau tshaj ib puas xyoo.
