iron-red
/ˌʌɪənˈrɛd/noun
The orange-red colour of rust or ferric oxide; a reddish pigment containing or consisting of ferric oxide.
adjective
Of an orange-red shade or colour; rust-coloured.
Origin
Early 18th century; earliest use found in John Woodward (d. 1728), physician, natural historian, and antiquary. From iron + red.