1. Ua kom tiv thaiv qhov chaw loj ntawm cov xim, tshwj xeeb tshaj yog lub hauv siab ntawm tes. Cov xim xim loj yuav ua rau pom lumps ntawm cov khaub ncaws tsis muaj teeb meem dab tsi uas koj siv rau kev luam ntawv. Thaum koj tawm hws, luam ntawv yuav airtight.
2. Lub tsho luv thiab cov tsho khos kab lis kev cai tau luam tawm nyob rau hauv peb qho kev qhia: sab pem hauv ntej, nraub qaum thiab ris kom tiv thaiv koj cov duab los ntawm kev sib txuas ntawm caj npab mus txog xub pwg. Txij li thaum loj me me ntawm kev luam ntawv feem ntau npaj txhij-rau-hnav luam ntawv, cov nqaws hauv cov lus qhia no yuav cuam tshuam rau kev luam ntawv. Lub luag haujlwm tseem ntxiv tus nqi.
3. Xaiv qhov screen luam tawm thiab tswj xim, vim tias yog tias muaj ntau xim, tus nqi yuav siab dua.
4. Vijtsam luam ntawv yuav tsum tiv thaiv kev siv gradation xim, vim hais tias gradation luam tawm yuav txawv heev ntawm qhov tshwm sim hauv kev tshuaj ntsuam, thiab nws txawv ntawm kev luam tawm ntawm cov ntaub thiab luam ntawv ntawm ntawv.
