Thermographic printing refers to two types of printing, both of which rely on heat to create the letters or images on a sheet of paper. The simplest type of thermography is where the paper has been coated with a material that changes colour on heating.
Thermographic printing refers to two types of printing, both of which rely on heat to create the letters or images on a sheet of paper. The simplest type of thermography is where the paper has been coated with a material that changes colour on heating.
Source: Wikipedia "Thermographic printing" · CC BY-SA 4.0
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