THERMOCHROMIC INK

An ink which changes colour or becomes transparent due to a change in temperature. The thermochromic effect is caused by changes in the chemical composition or physical properties of thermosensitive pigments. Thermochromic ink may have more than two color changes at different temperatures.

a —  Polymer substrate; b —  Image printed with thermochromic ink. View at a temperature of about 20 ˚С; 

c —  View when heated to 40 ˚С. Change of transparency

a —  Paper substrate; b, c, d —  Image printed with thermochromic ink. Change of color (grey – green – yellow) as the temperature increases up to 40 ˚С; 

e —  Zoomed fragment. Thermosensitive ink pigments. View at a temperature of about 20 ˚С; 

f —  Zoomed fragment. Thermosensitive ink pigments at a temperature of 40 ˚С