- 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.