Cov raj iav cov iav muaj feem ntau siv rau cov naj hoom rau ntau yam:

1. Kev khaws cia: khob yog imperme, lub ntsiab lus nws muab lub foob cua airtight uas pab khaws cov tshuaj tsw qab thiab tiv thaiv oxidation. Qhov no ua kom pom tseeb tias cov naj hoom tseem tshiab thiab tswj nws qhov zoo nyob rau lub sijhawm.
2. Kev tiv thaiv los ntawm Lub Teeb: iav fwj yog feem ntau tined lossis opaque, uas pab tiv thaiv cov naj hoom los ntawm kev kis tau. Lub teeb tuaj yeem demrade cov tshuaj tsw qab molecules thiab hloov cov ntxhiab, yog li siv iav pab kom muaj kev ncaj ncees ntawm cov naj hoom.
3. Kev thov kom zoo nkauj: iav fwj muaj cov timeless thiab zoo nkauj, txhim kho qhov kev nthuav qhia tag nrho ntawm cov naj hoom. Lawv tuaj yeem tsim nyob rau hauv ntau cov duab, ntau thiab tsawg thiab xim, pub rau cov ntim khoom muaj tswv yim uas nyiam cov neeg siv khoom.
4. Rov qab siv dua tshiab: iav yog cov khoom siv rov ua dua, ua rau nws muaj kev xaiv ib puag ncig zoo ib puag ncig piv rau lwm cov khoom ntim. Los ntawm kev siv iav fwj, tshuaj tsw qab hom tuaj yeem pab txhawb kom txo cov khib nyiab thiab txhawb kom muaj kev ruaj khov.
5. Kev pom ntawm tus nqi: Cov fwj khob feem ntau cuam tshuam nrog cov khoom kim heev thiab cov khoom lag luam zoo. Qhov hnyav thiab xav tias ntawm iav tuaj yeem muab qhov kev xav ntawm cov khoom lag luam zoo, ntxiv rau qhov pom tus nqi ntawm cov naj hoom.

Zuag qhia tag nrho, khob fwj muab cov txiaj ntsig kev ua tiav ntawm kev khaws cia thiab kev tiv thaiv, thaum tseem ua tiav kev lag luam hauv cov naj hoom.