Excerpt from The Philosophy of Color
When a ray Of sunshine passes through a glass prism it is decomposed or separated, and if the prismatic colors are received upon a white screen, you will there find a pure blue, a pure red, and a pure yellow.
These are colors of the spectrum, and known as the primary colors; and it is necessary, when speaking of any color, to bear these colors of the spectrum in mind as standards - a blue, for instance, that is the blue Of the spectrum.
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