(1) Yog tias "dawb xeb" pom tias muaj xim dawb, nws tuaj yeem ua ntej ntxuav nrog dej, ces cov zinc txheej yuav tsum tau qhuav nrog ib daim ntaub. Tom qab ntawd, siv ib lub slurry ua los ntawm talc hmoov thiab caustic soda nrog ib tug txhuam rau ntawm qhov chaw.
(2) Yog tias "dawb xeb" tau dhau los ua xim daj, cov kua dej ntawm cov tshuaj potassium acid tartrate thiab ammonium carbonate tuaj yeem txhuam mus rau qhov chaw corroded. Tom qab ntawd, siv daim txhuam cev soaked hauv calcium carbonate los so nws. Thaum kawg, yaug nrog dej thiab qhuav.
