Cov ntsiav tshuaj txheej tshuab (qab zib txheej tshuab) yog siv rau cov tshuaj rau cov tshuaj thiab qab zib txheej cov ntsiav tshuaj thiab zaub mov kev lag luam. Nws kuj yog siv rau dov thiab cua sov taum thiab edible ceev los yog noob.
Cov ntsiav tshuaj txheej tshuab yog dav siv los ua cov ntsiav tshuaj, cov tshuaj qab zib-coat, polishing thiab dov cov khoom xav tau los ntawm kev lag luam tshuaj, tshuaj lom neeg kev lag luam, khoom noj khoom haus, chaw tshawb fawb thiab tsev kho mob. Nws tseem tuaj yeem tsim cov tshuaj tshiab rau cov chaw tshawb fawb. Cov ntsiav tshuaj qab zib-coat uas polished muaj qhov ci ci. Lub tsho tiv no tsis zoo yog tsim thiab cov piam thaj hauv qab crystallization tuaj yeem tiv thaiv cov nti los ntawm oxidative deterioration volatilization thiab npog qhov tsis zoo ntawm cov nti. Ua li no, cov ntsiav tshuaj tau yooj yim dua los txheeb xyuas thiab lawv cov tshuaj hauv tib neeg lub plab tuaj yeem txo qis.
