The phenomenon of colour mixing using innovative LED technology. The apparatus consists of six LEDs (three inner LEDs and three outer LEDs). Both three inner LEDs (Red, Green & Blue) and three outer LEDs (Red, Green & Blue) are placed in a circular frame at 120 degree separation having equidistance from the center. The radius of curvature for outer three LEDs lying at the same point from the center of the frame so that mixing of the color are in equal proportion. To intensify the ultra bright LEDs (red, green and blue) a control box is provided. This control box is able to operate LEDs in inner or outer mode, vary the intensity of each LED from 0-100 %. It has also the wide range of color selection or mixing the color in varying ratio. This kit is supplied with a U channel bench, a black aperture screen, a translucent screen and a control box. The demonstration is enhanced by the included circular aperture, creating circles of overlapping colors, and a translucent screen, so the effect is visible from two sides for both additive and subtractive colour mixing.