Thermal papers are usually used to make stencils. Thermal papers are also called chemical coated papers because their surface is covered with a thermal coating that side can be identified via its smoothness and brightness. It is also called the thermal coated side of the paper. When we insert the thermal side into the printer, the print head produces heat when the paper is passed over it. The thermal coat turned out black thus the image or text is produced where the print head applies the heat onto the paper.