1. Thaum koj ua haujlwm hauv tsev lossis pw hmo ntuj, nws yog qhov zoo tshaj kom tshem tawm cov hniav nyiaj hniav kub kom cov hniav nyiaj hniav kub tsis deform los yog tawg vim hnyav hnyav los yog rub lub zog.
2. Yog tias lub caj dab raug huab cua, tshuaj pleev ib ce, tshuaj tsw qab lossis cov khoom siv acidic alkaline rau lub sijhawm ntev, lawv tuaj yeem tig dub vim yog cov tshuaj tiv thaiv sulfidation.Yog tias nws tsaus, koj tuaj yeem siv cov txhuam hniav mos thiab cov tshuaj txhuam hniav kom zoo nkauj ci.
3. Thov zam kev sib tsoo thaum hnav cov hniav nyiaj hniav kub, kom tsis txhob khawb qhov saum npoo ntawm cov hniav nyiaj hniav kub.Tsis txhob hnav cov hniav nyiaj hniav kub thaum da dej, nco ntsoov kom qhuav ua ntej khaws cia kom tsis txhob blackening los yog tarnishing vim ya raws.
4. Tsis txhob siv cov khoom no hauv cov chaw kub thiab dej hiav txwv kom tiv thaiv cov khoom hloov pauv vim raug sulfides.
5. Txoj kev saib xyuas zoo tshaj plaws rau cov khoom siv nyiaj yog hnav nws txhua hnub, vim tias cov roj hauv lub cev tuaj yeem ua rau cov nyiaj ua kom sov so.
6. Khaws rau hauv lub hnab ntim khoom kaw.Yog tias cov nyiaj tsis hnav rau lub sijhawm ntev, koj tuaj yeem muab tso rau hauv lub hnab ntim khoom ntim thiab khaws cia rau hauv lub thawv ntim khoom plig.Qhov no thiab huab cua cais tawm, tsis yooj yim rau oxidize dub.
