1.Nws siv tau rau kev ua cov foob pob hluav taws, cov teeb liab, cov iav nplaim, ua kua crystal iav substrishing tshuab thiab lwm yam hluav taws kub reagents.
2.Qhov yog siv los ua cov ntaub ntawv cathhode ntawm lub tshuab nqus tsev ntawm cov tshuab nqus hluav taws xob hauv kev lag luam hluav taws xob, tsheb pigments thiab qib siab pigments.
