| http://www.w3.org/ns/prov#value | - However, since silver has low chemical and physical stability, and is deteriorated by pollutants of a surrounding environment, vapor, heat, light, and the like, the alloy including silver and at least one other metal which is stable with respect to the surrounding environment such as gold, platinum, palladium, copper, indium, tin, and the like, may be also used.
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