TEMPERATURE INK - Temperature ink is ink that changes color when exposed to set temperatures. The color starts out clear and then becomes full color at a lower temperature and then returns back to clear when exposed to warmer temperature. Temperature inks are also available in a variety of color-to-color options where the ink starts out as one color and then once chilled turns to another color.
TOUCH-ACTIVATED INK - Touch-activated ink is a temperature-sensitive ink that disappears when in contact with body heat.
HEAT-ACTIVATED INK - Heat-activated ink is temperature sensitive ink that fades away when certain high temperatures are reached.