- noun a water-soluble plant pigment responsible for blue, violet and red colours
- A glucoside plant pigment extracted from grape skins which is red in acid and blue in alkaline conditions. It forms coloured complexes with metals e.g. grey with iron, green with aluminium and blue with tin, hence the off colours in e.g. canned pears where its reaction with tin gives the pears a pink colour.
- a colour pigment that provides the red colour of red wine