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When the thermal paper is placed in an environment above 70°C, the thermal coating begins to change colorUpdate: 2022-09-17

When the thermal paper is placed in an environment above 70°C, the thermal coating begins to change color. The reason for its discoloration also starts from its composition.
There are two main thermal components in thermal paper coating: one is leuco dye or leuco dye; the other is color developer. This type of thermal paper is also called two-component chemical type thermal recording paper.
When the thermal paper is heated, the leuco dye and the developer react chemically to produce color, so when the thermal paper is used to receive signals on a fax machine or print directly with a thermal printer, the graphics and text are displayed. Since there are many varieties of leuco dyes, the color of the handwriting displayed is different, including blue, purple, black and so on. 

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