off-coloured

From off- +‎ coloured.

off-coloured (comparative more off-coloured, superlative most off-coloured)

1. Having the correct, desired, or pure colour tainted or stained.
   • 1912, Arthur Conan Doyle, “‘It’s Just the very Biggest Thing in the World’”, in The Lost World […], London; New York, N.Y.: Hodder and Stoughton, →OCLC, page 55:

     The photograph was certainly very off-coloured. An unkind critic might easily have misinterpreted that dim surface.