Lead nyob rau hauv cov kua roj vanish yog feem ntau pom nyob rau hauv pem teb, ntaiv, qhov rooj, qhov rais thiab ntoo luas, thiab txawm tus me nyuam laus txaj. Txawm hais tias cov kua roj vanish nto tsis zoo, tus menyuam tuaj yeem nqos tau cov hmoov txhuas los ntawm zom rau ntawm cov kua roj vanish.
Puas qub stain thiab kua roj vanish muaj txhuas?
Txawm tias cov hmoov lead yuav tsis nyob hauv qhov stain, yog tias nws muaj lub tsho ntshiab (cov kua roj vanish), cov hmoov lead tuaj yeem muaj nyob hauv cov kua roj vanish. Qee cov kua roj vanish qub (thiab cov kua roj vanish ua lag luam) muaj cov hmoov txhuas hauv nws.
Thaum twg siv lead ua kua roj vanish?
Nplooj ntawv no los ntawm Stanford University hais tias: Xav tias txhua cov xim thiab cov kua roj vanish ua ntej xyoo 1980 muaj cov hmoov txhuas nrog rau cov khoom ua si qub, rooj tog zaum thiab cov khoom ua si. Yog li koj yuav tsum ceev faj thaum tshem cov khoom qub.
Puas yog sanding qub varnish txaus ntshai?
Cov khoom siv xuab zeb varnished tsim cov plua plav uas tuaj yeem ua rau muaj teeb meem kev noj qab haus huv thiab ua pa yog tias nqus taunqus pa los yog hmoov av ntawm cov kua roj vanish tuaj yeem ua rau ua pa nyuaj thiab mob ntsws ntsws. Nws kuj tuaj yeem ua rau mob qhov ntswg, qhov muag thiab qhov ncauj. Lub caj pas yuav o, thiab ua pa nyuaj.
Thaum twg cov hmoov txhuas raug txwv rau hauv cov kua roj vanish?
Cov xim pleev xim rau cov hmoov lead raug txwv rau kev siv nyob hauv 1978. Cov tsev tsim hauv Teb Chaws Asmeskas ua ntej 1978 zoo li yuav muaj qee cov xim hlau lead. Thaum cov xim tev thiab tawg, nws ua rau cov xim hlau lead thiab hmoov av.