By now, almost everyone has seen and had a chance to partake of the many cold-activated beer cans. Here is something a little different — a cold-activated spirits bottle. Box 19 of the approval for Metropolis says: “Labels contain thermochromatic ink – the cityscape will change when temperatures increase/decrease.” The label goes a bit further, to say “Chill your bottle to light up the night. Label changes when chilled.” Metropolis also has approvals for gin and vodka. Chromatic Technologies, Inc. explains that such inks change color as their temperature changes. “Our thermochromic inks all work the same way … below the activation temperature they are colored and above the activation temperature they are clear or lightly colored. As the ink cools, the original color returns.” B&H Colour Change Ltd. also claims to be a world leader in thermochromic printing and further explains:
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The whole label or a small part will change colour at a selected temperature to show when the beverage is the correct temperature for serving/drinking. Bottle shrink sleeves can be preprinted with thermochromic inks prior to sleeving. Board packaging for take-home multipacks can be printed with thermochromic ink, to encourage consumers to chill them in the fridge.