In this photo from July 29, 2015, a beaker filled spirulina extract is used to make a blue color 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 ... . In this photo from July 29, 2015, GNT employees prepare a berry pork sausage colored with plant-based natural food coloring at the GNT offices in Tarrytown, N.Y. Several major food makers are hoping to win over customers by vowin... .
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