paitung
/ˌpʌɪˈtʊŋ/ /ˌpeɪˈtɒŋ/noun
A silver-coloured Chinese alloy of copper and nickel, with arsenic or (later) zinc added as a whitening agent.
Origin
Mid 18th century; earliest use found in Richard Brookes (fl. 1721–1763), physician and author. From Chinese bái tōng (Wade-Giles transcription pai t'ung) white copper from bái white + tōng copper.