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About: Speculum metal     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatAlloys, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: chemical substanceyago:WikicatCopperAlloysyago:WikicatOpticalMaterialsyago:Abstraction100002137yago:Alloy114586769yago:Material114580897yago:Matter100020827yago:Mixture114586258yago:Part113809207yago:PhysicalEntity100001930yago:Relation100031921yago:Substance100019613yago:WikicatAlloys New Facet based on Instances of this Class

Speculum metal is a mixture of around two-thirds copper and one-third tin, making a white brittle alloy that can be polished to make a highly reflective surface. It was used historically to make different kinds of mirrors from personal grooming aids to optical devices until it was replaced by more modern materials such as metal-coated glass mirrors.