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1. Reasons for silver blackening
The blackening of silver ornaments is a normal natural phenomenon, because sulfur and oxides in air and other natural media have certain corrosive effects on silver. When the silver jewelry is worn for a long time, the combination of sulfur and silver will form a layer of black silver sulfide film on the silver jewelry surface, which begins to show as some tiny spots. After the vulcanization phenomenon intensifies, it slowly spreads into pieces, forming what people usually call silver scale, turning black, affecting the surface luster of silver jewelry, and people usually mistake it for fading.
The chemical reaction equation is 4Ag+H2S+O2=2Ag2S+2H2O.
2.银饰硫化后如何清洗?
挤少许牙膏,加少许水揉出丰富的泡沫,用软布擦拭直至光亮,缝隙可用细软毛牙刷刷净,再用清水冲净即可.对于复杂的构件和链子,可放入带泡沫的牙膏水中反复轻揉,再用清水冲净即可.硫化严重时,可用专业洗银水清洗.虽然进口洗银水号称是”不伤银”的,但是洗银水毕竟是化学制剂,不到必要时,建议不要选择使用.
3.  How to maintain silver jewelry daily?
较好的银饰保养方法是天天配戴,因为人体的油脂会使银发出温润自然的光泽(当 然也有人例外,有人的汗液中本身含有使银变黑的成分).佩戴时每天要用软布或 擦银布擦拭银饰表面,以保持光泽及干燥.不佩戴时用软布轻拭表面以清除水分和 污垢,置放与密闭袋子中,防止银饰表面与空气接触而氧化变黑.

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