purpurin

A reddish crystalline anthraquinone derivative, C₁₄H₈O₅, that is isolated from madder root for use as a biological stain and commercial dye.

A red coloring matter, C₁₄H₅O₂(OH)₃, used in dyeing, extracted from madder and prepared artificially by the oxidation of artificial alizarin.

A dyestuff resembling alizarin, found in madder root, and extracted as an orange or red crystalline substance.

A red anthraquinone dye, extracted from madder, that is used as a biological stain

A protein of the lipocalin family

A brownish or deep red decorative glass used in ancient times