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Thermal paper rolls are a special type of paper used in thermal printers. These printers use heat to create images on the paper, instead of ink or toner. The paper's surface is coated with a heat-sensitive material that changes color when exposed to heat.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.