SE863 - Self Adhesive Heat Activation SheetOur Thermochromatic Sheet is composed of a tough vinyl material which contains heat activating black to clear pigments. By exposing the sheet to body heat from hands, feet and faces, the black pigment disappears to reveal whatever is concealed beneath. Cover a favourite piece of art, or perhaps a simple maze to create a personal and interactive experience. Available in sizes upto 600mm x 600m contact us directly for a more specific size. 150mm x 150mm