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Thermal paper rolls are a special type of paper used in thermal printers. Thermal paper roll printers use heat to create images on the thermal paper, instead of ink or toner. The paper's surface is coated with a heat-sensitive material that changes color when exposed to heat.thermal paper roll Heat-sensitive coating: This coating reacts to heat by changing color, typically from white to black.Heat-sensitive coating: This coating reacts to heat by changing color, typically from white to black.