Achromatic

Any colour that lacks strong chromatic content is said to be achromatic, unsaturated, or near neutral. Pure achromatic colours include black, white and all greys.

  • Achromatic, unsaturated colours include browns, tans, pastels and darker colours.
  • Achromatic, unsaturated colours can be of any hue or lightness.
  • Achromatic, unsaturated colours are obtained by mixing pure colours with white, black or grey, or by mixing two complementary colours.
  • In colour theory, neutral colours achromatic, unsaturated colours are easily modified by adjacent more saturated colours and appear to take on the hue complementary to the saturated colour.  Next to a bright red couch, a grey wall will appear distinctly greenish.

https://en.wikipedia.org/wiki/colour_scheme>