Feasibility study of thermochromic inks for the packaging industry
A thermochromic ink is defined as an ink that exhibits colour changes depending on temperature. Thermochromic inks used in printing generally consist of an encapsulated three part system which includes a dye that changes colour, a compound that acts as a colour developer and a solvent. Due to the properties of the dye, the inks are always colourless above a certain temperature and coloured below a