Alkannet is a red pigment (Fig. 1) extracted from the roots of Alkanna tinctoria Taush and Alchusa tinctoria Lomfrom southern Europe. The pigment is almost insoluble in water but readily soluble in organic solvents. It has been used in Europe to color confectionery, ice cream, and wines, but it is not permitted in the United States.

The anthraquinones and napthoquinones have been the subject of considerable research interest lately. Twelve pat-

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