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Purple corn has one of the deepest shades in found in plants. Due to its richness in purple color, purple corn pigments have long been used to color foods and beverages.

The purple or black color of the black carrot originates from its pigments called anthocyanins. Black carrot anthocyanins change in molecular structure as the pH of solutions change. This change in structure results in a shift in shade from red, purple to blue as the pH changes from acidic to basic.