If you point an infrared remote control at a cameraphone or digital camera whilst one of the buttons is held down you’ll notice an odd effect: your eyes will see nothing different but the camera will pick up a purplely glow:

This is because the CCD (the “eye”) that the camera uses is sensitive to infrared light; whereas the human eye is not. The camera sees a type of light that your eye cannot.

Kameraflage is a special ink that only reflects infrared light. This enables designers to create clothes, posters etc. that show one thing to the naked eye and something completely different to digital cameras.