On the chromatic circle, each color is located at the opposite (facing) of the complementary color.
The complementary color to a warm color is a cold color and vice versa.
For example, opposite to the blue, there is the Orange Color, opposite to the red and green is found opposite the yellow found violet.
It is said of these pairs of colors they are complementary because they are mutually reinforcing and highlighting together, each color brings out the other such as red is redder if accompanied green and so on.
By mixing two complementary colors, you get a shade of gray. A touch of another color then allows for neutral but slightly colored tones. Besides, to get darken gray or color you can play with colors The additional instead of black.
