Polished brass or nickel signs at the square stone entrances announced the firm and the nature of the business in rather neat and reserved terms.

方石砌成的门口挂着闪光的铜牌或镍牌，上面用简洁谨慎的措辞标明商号的名称和性质。 收藏。

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European Union guidelines say that earrings are supposed to contain less than 0.05% nickel by weight and should not release more than 0.5 micrograms of the metal per square centimetre of their surface area per week.

BBC: Earring