Isaac Newton

In the 17th century, Isaac Newton analyzed the composition of light. In a dark room, he sent a thin beam of daylight through a glass prism. The prism broke the daylight in a range of colors from red to violet, the so-called color spectrum. The order of the colors remained constant – red, orange, yellow, green, blue and violet. Newton operated with a seventh color between blue and violet, which is called indigo, a warm dark blue color. Today, it is common to operate only with the six colors, also called spectral colors.