Irreversible thermochromic inks for printing

Irreversible thermochromic inks react with a permanent colour change when the ink reaches a certain limit temperature.

After reaching a specific temperature, together with its increase, the ink turns from transparent into coloured. The change is permanent and irreversible. The lowest temperature of change is 60°C, the highest ones reach even up to 200°C.

Irreversible thermochromic inks are used as indicators of exceeding high temperatures or of sterilisation. They can also be used for coating thermal papers or other thermosensitive materials.