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“Most of our thermochromic packaging inks are water-based flexographic or gravure inks, and they have similar handling and stability issues as other water-based inks, plus a few others,” says Duncan. He adds that inks as supplied must be stored in a cool place; the cooler the better, without freezing. “Inks stored at +75ºF will have a shelf life of around three months, but inks stored at lower temperatures can last as long as three years,” he says.