Scientists at the University of Rhode Island (URI; Kingston) say they have developed heat-sensitive pigments that can be readily dispersed into commercial polymers causing them to change color reversibly at a particular temperature. The materials have a wide range of potential applications, the researchers say, such as fire doors that change color when hot; sportswear that warns if an athlete is overheating; food packaging that hsows if a product has not been refrigerated properly; and road signs tht change color to warn of ice.
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