Cov txheej txheem vuam ntawm cov raj tooj liab tooj liab yog zoo ib yam li ntawm cov cua txias txias tooj liab. Qhov sib txawv nyob ntawm qhov vuam hlau siv rau aluminium bronze yeeb nkab vuam. Muaj cov kev cai. Tom qab daim ntawv thov vuam hlau ua tau raws li qhov yuav tsum tau ua, nws yuav tsum tau pab los ntawm cov laug muab tshuaj txhuam. Qhov muab tshuaj txhuam zoo tshaj plaws los siv yog hmoov. Cov nplaim hluav taws uas siv rau hauv qhov vuam ntawm txhuas yeeb nkab tooj liab yuav tsum yog nplaim hluav taws. Cov txheej txheem txheej txheem yog thawj zaug siv cov tshuaj txhuam txhuam rau qhov uas yuav tsum tau muab tshuaj txhuam, thiab tom qab ntawd ua kom sov. Hauv cov cua sov, cov nplaim hluav taws kub tsis tuaj yeem kov tam sim muab tshuaj txhuam txhuam. Qhov ua kom sov sov yog nyob nruab nrab ntawm cov raj tooj liab tooj liab thiab cov dej tsis sib thooj, thiab lub qhov ncauj nplaim taws tau muab tso rau ntawm no thiab txav mus los tom ntej ntawm 2 ntsiab lus tam sim ntawd. Tom qab lub raj tooj liab tooj liab tau ua kom sov, cov kab laug sab laug twb tau yaj thiab hloov mus rau hauv lub xeev ua kua. Lub sijhawm no, cov xaim hluav taws xob ua kom sov tuaj yeem tso tam sim rau ntawm qhov chaw vuam txoj haujlwm. Thaum cov hlau txuas tau yaj, txav cov nplaim taws rov qab mus rau 2 o' moos tam sim ntawd kom txog thaum cov hlau txuas tau yaj mus rau qhov sib txawv.
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