Lub ntsiab ib puag ncig yam
Atmospheric composition & pollutants
Kev lag luam huab cua (SO₂, plua plav) → patina uadarker, tob xim av, daim ntawv sai dua.
Nyob deb nroog / huv si → patina yoglighter, txiv kab ntxwv-xim av, daim ntawv qeeb.
Ntug hiav txwv cua (chloride / ntsev tsuag) → patina uapaler, paj, nyuaj rau stabilize.
Humidity & ntub-dry cycles
Nruab nrab, nquag ntub-qhuav voj voog →uniform, ceev xim kev loj hlob.
Lub sij hawm ntev dampness → xoob, lub teeb, tsis sib xws xeb.
Kev nyab xeeb qhuav → qeeb heev patina tsim.
Hnub ci & kub
Lub hnub ci muaj zog → tsaus, ntau dua patina.
Qhov chaw ntxoov ntxoo → qeeb, sib zog, xim tsis sib xws.
Lub voj voog kub cuam tshuam rau oxidation tus nqi thiab patina kom loj hlob.
Los nag, kua & nto orientation
Vertical, zoo-drained nto → xim sib xws.
Kab rov tav lossis dej-ntug thaj chaw → streaks, suab tsis sib xws.
Cov nag hnyav tuaj yeem ntxuav cov xeb xoob thiab ua rau tsis muaj xim ib ntus.
Cua & cua
Qhov cua zoo → ceev ceev, txawm tias ziab → ruaj khov, ntom patina.
Stagnant, ntub dej → tsis sib xws, qeeb xim hloov.
