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Alkanna tinctoria (L.) Tausch - syn.Alkanna tuberculata - Boraginaceae
alkanet, dyer's alkanet, dyer's bugloss, Schminkwurz, Alkanna, Färberkraut
Perennial herb, up to 30cm high, native to South Europe, West Asia and North Africa, also cultivated there; stem and leaves hairy; leaves simple, alternate, lanceolate; flowers bright blue.
„The root produces a fine red colouring material which has been used as a dye in the Mediterranean region since antiquity. The root as a dyestuff is soluble in alcohol, ether, and the oils, but is insoluble in water… In alkali environments the alkanet dye (alkannin) has a blue color, with the color changing again to crimson on addition of an acid.“ http://en.wikipedia.org/wiki/Alkanna_tinctoria