Researchers have known for many years that workers in ancient Egypt recycled papyrus for different purposes -- one particular use was creating decorated boxes into which mummies were placed. Papyrus scraps were glued together using paste and plaster, similar to modern paper-mâché projects... The technique involved using a digital imaging method that interpreted light bounced back from a subject. Prior research had shown that the pigment in ink used by the ancient Egyptians over 2000 years ago could fluoresce under the proper infrared filter. By using such filters with digital imaging technology, the team was able to see the ink...