• Achromatic means without colour so refers to surfaces or objects that appear white, grey or black. Achromatic colours lack hue or saturation but can be described in terms of their brightness.
  • When mixing paint, achromatic colours are produced by adding black and/or white until the original colour is fully desaturated.
  • Achromatic colours are produced on digital screens by mixing red, green and blue light in equal proportions.