Thermal paper with security features
 A thermal paper with an image derived from a water-based security ink has more than one means of security. A variable light absorbing and/or transmitting pigment or dye in the ink is a first security and a water repelling agent in the ink is a second security. A pseudo-watermark from the coloration of the ink under ambient conditions is a third security. Visible images can be generated from the printed ink upon exposure to UV or infrared light. Methods of preparing the thermal paper comprise printing the security ink on thermal paper with only one thermosensitive coating on the surface opposite the thermosensitive coating. 
NCR Corporation
B C
B41M C09D
inventional inventional
Yaoping Wendell B. Christopher L. Maurice W.
Tan Halbrook, Jr. Langston Lewis