A red colouring matter obtained from the root of the plant alkanet, Alkanna tinctoria, used as a food colouring and in cosmetics; also called alkannin.
Systematic name: 5,8-dihydroxy-2-[1-hydroxy-4-methylpent-3-enyl]naphthalene-1,4-dione; C₁₆H₁₆O₅.
anchusin/ˈaŋk(j)uːsɪn/ /aŋˈk(j)uːsɪn/ /anˈtʃuːsɪn/
Mid 19th century; earliest use found in William T. Brande (1788–1866), chemist. From French anchusine from scientific Latin Anchusa + French -ine, apparently after anchusique.