Cov khoom yog zoo li lub pa taws kub, thiab cov tshuaj tsw qab yog lit kom sov cov plooj (porcelain) saum toj no, ua rau cov naj hoom poob rau hauv lub thawv kom evaporate thiab sib tsoo nrog cov ntxhiab tsw ntxhiab tsw.Lub thawv yog ib qho kev sib xyaw ua ke ntawm frosted thiab pob tshab, nthuav qhia qhov xav tsis thoob.