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Color & Temperature Changing Ink

Thermochromic inks or dyes are temperature sensitive compounds that temporarily change color with exposure to heat. They come in two forms, liquid crystals, and leuco dyes.

Leuco dyes are easier to work with and allow for a greater range of applications. Some applications include: Financial checks with a “security thumbprint that changes color when a thumb or fingertip is holding it. It helps guard against fraudulently printing copies of checks.

Some other applications are on food labels. Such as, an indicator on labels of maple syrup that change color when the syrup is warm.

Many applications are novelty effects in labels, areas that are heat-sensitive and color-changing ink.

From ice cream cartons, beer labels, to hard goods such as cups and mugs as well as clothing.

On the food containers, there is a minor functional purpose in letting the user know if the food is roughly in the optimal temperature range.


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