Blueberries, blue corn, and blue potatoes are actually purple. Blue food is a rare occurrence in nature. There are no leafy blue vegetables, no blue meats, and aside from blueberries and a few blue-purple potatoes from remote spots on the globe, blue just doesn't exist in any significant quantity as a natural food color. Furthermore, our primal nature avoids food that are poisonous. A million years ago, when our earliest ancestors were foraging for food, blue, purple and black were "color warning signs" of potentially lethal food.
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