<P> Sterling silver is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper . The sterling silver standard has a minimum millesimal fineness of 925 . </P> <P> Fine silver, for example 99.9% pure silver, is relatively soft, so silver is usually alloyed with copper to increase its hardness and strength . Sterling silver is prone to tarnishing, and metals other than copper can be used in alloys to reduce tarnishing, as well as casting porosity and firescale . Such metals include germanium, zinc, platinum, silicon, and boron . Recent examples of alloys using these metals include Argentium, Sterlium, Sterilite, and Silvadium . </P> <P> One of the earliest attestations of the term is in Old French form esterlin, in a charter of the abbey of Les Préaux, dating to either 1085 or 1104 . The English chronicler Orderic Vitalis (1075--c. 1142) uses the Latin forms libræ sterilensium and libræ sterilensis monetæ . The word in origin refers to the newly introduced Norman silver penny . </P>

What are the component elements for sterling silver
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