alkannin

from The Century Dictionary.

• noun A coloring matter, C₁₅H₁₄O₄, obtained as a dark reddish-brown powder from Alkanna tinctoria.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A natural dye and naphthoquinone derivative obtained from the borage plant Alkanna tinctoria, used as a food colouring and in cosmetics.