Tidirefi has thermochromic inks, with a change of color from black to red and from black to blue.

They are inks of advanced manufacture that suffer a permanent change of color when they undergo certain conditions of humid heat, as the processes of sterilization used in the sector of the alimentary industry

These inks show good resistance to solvents and alkalis after color change and have the ability to penetrate and resist oily surfaces, coatings or varnishes.