other and provided the greatest contrast; he named red and blue (modern cyan), yellow and violet, and green and "a purple close to scarlet".

In the following decades, scientists refined Newton's color circle, eventually giving it twelve colors: the three primary colors (yellow, blue, and red); three secondary colors (green, purple and orange), made by combining primary colors; and six additional tertiary colors, made by combining the primary and secondary colors.

In two reports read before the Royal Society (London) in 1794, the

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