Thermal paper is a special paper infused with chemicals which are sensitive to heat. Added along with these chemicals is a special dye. When thermal paper is exposed to heat, for instance in a thermal printer, there is a change in color of the paper because of the heat.
Thermal paper is a type of paper that has a specialty coating that allows for inkless printing. When heat (via a thermal paper printer) is applied to the coating, the result is a sharp, clear image, without the need for ink or ribbons. Thermal paper printing has numerous important uses in society, from lifesaving applications in healthcare to money and time-saving applications in retail and commerce. Thermal paper printing is faster, higher quality and lower cost than many other types of printing.