By applying this experiment to different pairs of colors shown in the chromatic circle on Plate 32, we obtain the results indicated by the table on page 30.
We will now try sea-green and red-purple. After shifting the eyes at regular intervals of a second each, from one to the other of the two colors named, for a half minute, then suddenly looking at the black dot between the two, we will see a pure yellow tint, which is an equal mixture of a red tint (the complement of sea-green) with a green tint (the complement of red-purple). See illustration below.
It will be noticed that by the mixture of the complements of orange and violet (blue and yellow) in the eye, we reach the same result as in the mixture of blue and yellow pigments—green. But by the mixture of the complements of sea-green and red-purple (red and green) in the eye, we get yellow, while the mixture of red and green pigments produces brown. If the eyes are allowed to rest upon the orange twice as long as upon the violet, the result will be (when we look at the dot between the two) we will see a tint in which blue, the complement of orange, will strongly predominate; and if we allow the eyes to rest upon the violet twice as long as upon the orange, then we will see a tint in which yellow, the complement of violet, will predominate. This rule will also apply to any pair of colors given in the following table; also to any pair which may be selected from the chromatic circle on Plate 32.
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