"Almost all visible colors can be obtained by the additive color mixing of three colors that are in widely spaced regions of the visible spectrum," according to physics Professor Nave of Georgia State University. The three colors -- red, green, and blue -- produce white when mixed together. Two of the three colors can be paired to form orange, purple, and yellow. The mixtures are known as secondary colors. The three secondary colors combine through subtractive color mixing, in which they form black.
Green is formed from the primary colors yellow and blue. The secondary color combines with yellow to produce chartreuse, or lime green. It can also meld with blue to form aquamarine, or green-blue. Green is universally known as the color of nature. It is found in grass, the leaves of trees, and in numerous fruits and vegetables. It symbolizes fertility, growth, and freshness. Dark green is commonly associated with money, since it appears in United States' currency.
Purple is the combination of the primary colors, red and blue. Purple creates the tertiary color indigo when mixed with blue. It also forms the tertiary color pink when combined with red. The color is associated with wealth and nobility, since royalty often donned cloaks of purple fabric. It conveys extravagance and pairs well with metallic colors, such as gold. Purple is a rare color in nature, although it is abundant in some fruits and vegetables.
Orange is the product of red and yellow. The secondary colors combines with yellow to produce amber, or gold. It combines with green, as well, to produce chartreuse as noted above. Orange is associated with energy, creativity, and stimulation. It a very bright color that attracts the human eye. Orange is found in many citrus fruits, as well as fall vegetables like squash and pumpkin.