In this photo from July 29, 2015, bottles of liquid colored with plant-based natural colors are displayed at the offices of GNT in Tarrytown, N.Y. Several major food makers are hoping to win over customers by vowing to rid their products of artificial ingredients. But replicating the vivid colors Americans have to expect without synthetic dyes presents technical and regulatory challenges, and in some cases will mean new hues for popular products.
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