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Heat and humidity are two of the biggest threats to thermal paper. If not properly managed, they can cause fading, darkening, smudging, or even completely unreadable receipts. Why Is Thermal Paper Sensitive Thermal paper is coated with a special chemical layer that reacts to heat. When the print head applies heat, the coating changes color to form text or images. However, this same coating can react to unintended heat or moisture in the environment. High temperatures can dark