First, we should know, “What is color?”
The simplest definition is what our eyes see when an object reflects light is color. There is another tough definition, but I think knowing that is also important.
According to the Committee on Colorimetry of the Optical Society of America,
Color is the general name for all sensations arising from the activity of the retina of the eye and its attached nervous mechanisms, this activity being, in nearly every case in the normal individual, a specific response to radiant energy of certain wavelength and intensity.
For practical applications, there are three primary colors available, i.e., red, yellow, and blue, as the human eye is trichromatic. They are mixed to create the other available colors. Three secondary colors, green, orange, and violet, are also available. They are created by combining two of the primary colors. Any of the colors can be produced by the primary colors by addition or subtraction between them.Here, a is additive color mixing, and b is subtractive color mixing. In additive color mixing,
Red+Green = Yellow
Green+Blue = Cyan
Blue+ Red = Magenta
Red+Green+Blue = White
And in subtractive color mixing,
White-Red = Cyan
White-Green = Magenta
White-Blue = Yellow
When we see the color books or in exact the Pantone book, we see a massive number of colors. But they are not pure colors. Most of the dyes have five to twenty colors, but the other colors can be made by combining the available colors.
If you mix pure colors, you will get clear, bright, and pretty results than mixing the existing mixtures. Purple gives more sparkling results when it is made by mixing pure fuchsia and pure turquoise rather than making it by the combination of red and turquoise.
Sometimes pure colors show the same effect. The effect of using a combination of pure yellow and pure red will be quite the same as a dye which absorbs light in both yellow and red region of the spectrum. A wintery palette is made by the darkish blue when they are substituted for the clearer blues, and an autumnal palette is created by the orangish-yellow when they are replaced for the clearer yellows. The produced colors will be subtle and less bright.