Thermochromic ink shows ideal drinking temperature of beer

Grolsch has introduced the new ‘Cool meter’ on their cans in the Netherlands, using a recently developed Thermochromic ink. This temperature sensitive ink, which has been developed in partnership with Rexam, indicates when the beer inside is cold enough to drink. The ink, which begins to change colour at 11°C, turns blue when the beer has reached the ideal drinking temperature (between 6° – 8° C). The new ‘Cool meter’ will be available on all Grolsch 330ml cans in the Netherlands from this summer on.

The ink has been developed in partnership, between Grolsch & Rexam, using a new generation of Thermochromic inks. Ann Bonner, Market Manager at Rexam says, “The ink has been reformulated and improved to provide a better depth of colour at the required temperature. For the consumers it means that the colour of the ‘Cool meter’ is more clearly visible and therefore it is easier to check when the beer is chilled, giving the ultimate, pleasurable drinking experience.”

The temperature change interval is set by Rexam Beverage Can Europe in consultation with Grolsch. The colour of the ink changes back to the original colour of white when the beer becomes warmer.