[C.I. 75530, 75520]. The root of an herb, Alkanna, or Anchusa tinctoria (family Boraginaceae), that yields red dyes alkannan and alkannin; used as a coloring agent; also used, combined with tannin, as an astringent.
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[C.I. 75530, 75520]. The root of an herb, Alkanna, or Anchusa tinctoria (family Boraginaceae), that yields red dyes alkannan and alkannin; used as a coloring agent; also used, combined with tannin, as an astringent.