Meet the Blue Crew, Scientists Trying to Give Food, Flowers, and More a Color Rarely Found in Nature
Plants have evolved many classes of pigments: Chlorophylls color leaves green; carotenoids come in orange (carrots), red (tomatoes), and yellow (maize); and betalains produce the red color of beetroot. But only one class of pigments is capable of producing blue: the anthocyanins. (The word literally means “blue flower.”) And even most anthocyanins are not blue but red, because they naturally absorb blue light; only if the plant tacks on chemical groups can the molecule shift toward absorbing red. …
