Scientists have discovered why blueberries are blue when they should be red.
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Scientists have discovered why blueberries are blue even though their skin only has red pigment.
Scientists from the University of Bristol have found an answer to the question of why blueberries and some other berries appear blue, although their skin contains only a dark red pigment, anthocyanins.
Blueberries, the scientists reported, are covered with a layer of wax, the miniature structures of which scatter blue and ultraviolet light. This allows humans to see a blue tint and birds to see ultraviolet blue.
Blue pigments are rare because they require large molecules that require a lot of energy.
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