The additive mixing of colors is not commonly taught to children, as it does not correspond to the mixing of physical substances (such as paint) which would correspond to subtractive mixing. Two beams of light that are superimposed mix their colors additively.
By convention, the three primary colors in additive mixing are red, green, and blue. In the absence of light of any color, the result is black. If all three primary colors of light are mixed in equal proportions, the result is neutral (gray or white). When the red and green lights mix, the result is yellow. When green and blue lights mix, the result is a cyan. When the blue and red lights mix, the result is magenta.
green–red–blue additive mixing is used in television and computer monitors, including smartphone displays, to produce a wide range of colors. A screen pixel uses a juxtaposition of these three primary colors. Projection televisions sometimes have three projectors, one for each primary color.