Isaac Newton performed an experiment where sunlight was passed through a prism and an assistant demarcated seven bands on the projected spectrum corresponding to red, orange, yellow, green, blue, indigo and violet. In additive colors, it's RGB; - color created by mixing together light of two or more different colors. In light, yellow is not a primary color. Calling the colors "psychological primaries", Ewald Hering, a German psychologist, came up with the concept of the 4-primary color wheel in 1878. This is the case in TV and computer monitor colors. Tertiary colors are created when a primary color is mixed with a secondary color. This model starts with darkness and adds light in colors. This differs from the color mixing wheel, which only has three primary colors. The primary colors of light are red, green, and blue. These colors are also called basic colors of light. PRIMARY COLORS AND SECONDARY COLORS. Although, green is in fact a product of two primary colors in which are blue and yellow. Paint is more of an exception, as light really is the source of all color. Red, green, and blue are the additive primary colors normally used in additive color system. The four primary colors in the 4-primary color wheel are blue, yellow, green and red. There are numerous competing primary color systems throughout history. Primary Colors The colors that cannot be obtained by mixing any other colors in any proportions are called primary colors. There are simply three primary colors which are red, blue and yellow. Examples of tertiary colors are blue-green, red-orange and yellow-green. Continuing to mix colors together provides an endless mix of possible hues. Any other colors are the products of those three primary colors. By mixing primary colors in equal amounts, we get the secondary colors orange, green, and purple, which in turn allow us to replicate any color in the natural world. In painting, green is not a primary color. So the answer to your question is no, as part of a tangible material the color green is not a primary color.