Robert Klein’s sticker turns color as an apple ripens. A thumbnail-sized white sticker that turns blue as the fruit to which it’s affixed ripens is one step closer to reaching apple growers and packing houses. The Redi Ripe sticker underwent field tests this summer and fall in a Wenatchee, Washington, apple orchard used for research. Developed by a retired psychologist and a University of Arizona agriculture professor, the product is expected to be available commercially next year. “We want to have it ready for the next apple harvest, although it won’t be used in mass quantities,” said Dr. Robert Klein, […]