speculum metal

noun
1.
any of several bronze alloys with a high tin content, often containing other materials, as silver, brass, lead, zinc, or arsenic, used for making mirrors and reflectors.
Also called speculum, speculum alloy.
Origin
1790–1800
British Dictionary definitions for speculum-alloy
speculum metal
 
n
a white hard brittle corrosion-resistant alloy of copper (55--70 per cent) and tin with smaller amounts of other metals. It takes a high polish and is used for mirrors, lamp reflectors, ornamental ware, etc

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Tile value for speculum

14
20
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