Hidden images created with commercial inkjet printers
Thursday, December 8, 2016 - 15:31
in Physics & Chemistry
Researchers have developed a way to use commercial inkjet printers and readily available ink to print hidden images that are only visible when illuminated with appropriately polarized waves in the terahertz region of the electromagnetic spectrum. The inexpensive method could be used as a type of invisible ink to hide information in otherwise normal-looking images.