Ntau cov vaj huam sib luag zoo nkauj ntawm kev ua lag luam hloov xim tom qab tau coated nrog cov kua roj vanish ntshiab. Piv txwv li, cov ntoo qhib dawb thiab dawb maple tig daj tom qab varnishing, thiab nws tau hais tias lub sijhawm ntev dua, qhov xim daj ntau dua.
Thaum xaiv cov vaj huam sib luag zoo nkauj, so lawv nrog cov ntaub ntub dej kom pom cov nyhuv, vim qhov no yog ze rau cov nyhuv tom qab siv cov kua roj vanish. Sij hawm dhau mus, cov vaj huam sib luag zoo nkauj yuav ua rau cov xim sib sib zog nqus thiab oxidize, thiab cov xim yuav inevitably tig daj. Xaiv cov kua roj vanish zoo yog qhov tseem ceeb.
Yog vim li cas rau discoloration yog raws li nram no:
(1) Ester cov kuab tshuaj nyob rau hauv cov kua roj vanish ntshiab react nrog hlau ntim thaum raug dej, ua rau blackening.
(2) Turpentine yooj yim tsim cov xim liab -xim xim av hauv cov nruas hlau.
(3) Cov hmoov kub thiab nyiaj tau yooj yim dhau los ua kua qaub nrog cov kua roj vanish, ua rau cov xim hloov ntsuab, tsaus, thiab poob nws cov luster.
(4) Discoloration vim nag lossis daus tom qab lub sijhawm cia.
Cov kev tiv thaiv yog:
(1) Rau cov kua roj vanish shellac, uas yog feem ntau ua rau cov xim tsis muaj xim, siv cov khoom tsis yog -hlau ntim rau khaws cia.
(2) Ntxiv cov hmoov kub thiab nyiaj ua ntej siv cov kua roj vanish ntshiab; tsis txhob ntxiv lawv ntxov dhau thiab khaws cia rau hauv cov kua roj vanish.
(3) Rau cov xim uas tsis muaj xim vim los nag, yog tias nws tsis yog qhov teeb meem zoo, lawv tseem tuaj yeem siv tau tom qab sib tov sib xyaw.
