THERMOCHROMIC INK

Thermochromic ink, also called thermosensitive ink, is an ink that changes colour according to temperature. This colour change is reversible: the ink returns to its original colour when the temperature returns to its initial state.

Characteristics of thermochromic ink:

• Reversibility

The ink changes colour when heated or cooled, then returns to its original colour when the temperature returns to normal.

• Temperature sensitivity

The temperature at which the ink changes colour can vary depending on the ink’s formulation. Some types of ink change colour at very low temperatures, while others react at higher temperatures.

• Varied applications

Used for immediate checking in various fields, such as labels for temperature-sensitive products (like beverages or food products), diplomas, certificates and ticketing.

• Technology

Often based on liquid crystals or thermochromic pigments. Liquid crystals change their molecular structure with temperature, thereby altering the light they reflect and thus their visible colour.

Examples of use:

• Security : To prevent counterfeiting, banknotes and official documents can include thermochromic ink.

• Temperature indicators : Labels on certain food products or beverages use this ink to indicate whether the product is at an appropriate temperature for consumption.