Images Fading on Thermal Paper
Most POS-grade thermal papers use dye, combined with coreactant technology, to form an image, which causes a sensitivity to UV light and thus causes the image to fade with extended exposeure. The images’ stability depends on the degree that the image was originally developed and the intensity of the UV light.
In order to prevent fading, standard POS-grade thermal paper should be stored in a dark area, with the temperature no higher than 77 degrees farenheight and a humidity range of 45-65 percent. If all of these conditions are met, there is no reason that the image should last any less than 5-7 years. There are also different grades of thermal paper, so choosing certain grades over others may better suit your needs.