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Applications for thermochromic inks have expanded. John Signet, marketing manager, Water Ink Technologies, says thermochromic inks are used for security, novelty, and temperature-change indicators in packaging applications.

“Thermochromic inks are used in packaging and labels for refrigerated items such as beverages,” says Whelan. They are also used in specialized packaging for CDs and DVDs, “typically associated with a theme pertaining to the music or movie promoted, providing a package that will change color with the heat from the shopper’s touch,” she adds.