Thermal printing refers to digital printing that produces printed images by selective heating of thermochromic or thermal papers. These papers are coated with thermal chemicals that tend to change its color when exposed to heat. The chemicals applied on the thermal papers when exposed to heat changes its color so as to display the intended images. Unlike conventional ink-jet printers, thermal printing use chemically coated papers for printing different images.

Thermal printing using chemicals is majorly used in machines for printing receipts, bills, lottery tickets and other labels. The specific combination of thermal printing chemicals used depends on the printing machine as well as the manufacturer. It can be a combination of waxes, dyes, inert pigments and anti-oxidants. 

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When heat is applied to the coated places, a threshold temperature is reached making the paper darken in those spots. Thus, for optimum utilization of this ability of the thermal chemicals to color the paper darker, printing machines are used which integrate a print head. This print head facilitates the application of heat in the right places. The chemical coating turns into black in the heated areas producing an image. Thermal printing provides fast printing. Moreover, due to use of chemicals for printing, the printed images are highly clean and readable.