red:0 green:0 blue:0
This pages lets you play with the RGB scheme, combining red, green, and blue light to make any color. The sliders control the red green and blue lights, each ranging from 0 (off) to 255 (maximum). The intersecting rectangles show the result of adding the red, green, and blue light together -- any color can be created in this way.
To make pure red, green, or blue light, just turn up that color, leaving the other two at 0. A few other common combinations: