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Anthocyanins, also called anthocyans, are water-soluble vacuolar pigments that, depending on their pH, may appear red, pink, purple, blue, or black. In 1835, the German pharmacist Ludwig Clamor Marquart named a chemical compound that gives flowers a blue color, Anthokyan, in his treatise Die Farben der Blüthen. Food plants rich in anthocyanins include the blueberry, raspberry, black rice, and black soybean, among many others that are red, pink, blue, purple, or black. Some of the colors of autumn leaves are derived from anthocyanins.
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