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Not all anthocyanins are purple; they vary in color from red to purple to blue, green, or yellow, depending upon the level of their pH. The purple colors of this cauliflower , grapes, fruits, vegetables and flowers comes from natural pigments called anthocyanins .
The blue-dominated spectral color beyond blue is referred to as purple by many speakers in the United States, but this color is called violet by many speakers in the United Kingdom. [3] [4] In some British authoritative texts the term purple refers to any mixture of red and blue, suggesting the color term purple covers the full range between ...