Two primary colors combined creates a secondary color.
The colors on the color spectrum combined to produce gray are black and white.
White (although technically white is not a color but ALL the colors of the rainbow combined)
If you are talking about light, then white is the combination of all colors.
Black
brown
Complementary colors are pairs of colors which, when combined the right way, produce a neutral color. The colors are either white, grey, or black. Nothing else.
all the colors of light combined make white light. In other words, white light is composed of all colors of light.
I believe the colors are red, green, and blue.
Complementary colors do neutralize when combined. When you mix two colors across the color wheel they mix to make brown. It is difficult to determine which two complementary colors make up a very even brown.
White Light
Goldfish see in color.