rouge de fer
/ˌruːʒ də ˈfɛː/Ceramics
noun
An orange-red enamel colour made from a base of ferric oxide, associated frequently with Chinese porcelain.
Origin
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.