speculum metal


Definition of speculum metal

: an alloy capable of taking a brilliant polish, used for making reflectors, and being commonly a hard brittle alloy of copper and tin in various ratios (such as tin 33 to copper 67) with often a little arsenic, antimony, or zinc added to improve the whiteness

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Cite this Entry

“Speculum metal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/speculum%20metal. Accessed 29 Oct. 2020.

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