The Color Mark Sensor offers maintenance-free solid- statereliability, with the sensing performance until now offered only by short-lived incandescent color mark sensors. The Colour Mark Sensor reliably detects all color contrasts found in common product registration color mark applications – even such extremely low contrasts as 20 percent yellow printed on white. In addition, three colour LED light source and hybrid optics eliminate the need to switch between different color light sources for different color contrasts.