Achromatic colours (Neutral colours)
Colours which have neither hue nor chroma attributes; i.e. pure blacks, whites and greys. (Note: very few colours are achromatic; most have some degree of hue – see Near neutral colours). See Fig.1.
Simple definition: Colours which we perceive as pure whites, blacks or variations of grey.
See also: Greyscale
Fig. 1. Range of achromatic colours from white to black.
