One of the mysteries of the English language finally explained.
An orange-red enamel colour made from a base of ferric oxide, associated frequently with Chinese porcelain.
Late 19th century; earliest use found in William Chaffers (1811–1892), authority on hallmarks and potters' marks. From French rouge de fer the colour of iron oxide, enamel colour used in China from rouge + de + fer iron.
rouge de fer/ˌruːʒ də ˈfɛː/
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