Here are some links, I hope you find them useful. http://www.a1.nl/phomepag/markerink/mainpage.htm they have some digital infrared links. http://www.echeng.com/photo/infrared/ http://www.lesjorgensen.com/ regards, Roderick > > Here are a couple of early articles on the topic ... > > http://www.rit.edu/~andpph/text-agfa-1280-ir.html > http://www.rit.edu/~andpph/text-ir-examples.html > > or http://www.rit.edu/~andpph/text-infrared-ultraviolet.html > and another one > > http://www.echeng.com/photo/infrared/ > > regards, > > Andy >