Stopping ID fraud / Chemical News, 24 Jan 2007
http://digbig.com/4qwwm
"A group has developed a polymer film containing three fluorescent dyes and recorded information in the film by selectively treating it with light. Using this technique, they recorded three different marks of identity on top of each other: a photograph, signature and fingerprint. These could then be seen by looking at the film under different wavelengths. The researchers estimate that these films could produce ID cards that would be stable to daily reading for up to four years."