Page:The color printer (1892).djvu/96

 Another experiment showing that sea-green (which is an equal mixture of green and bine) is the complement of red, is shown by mixing the spectral complements of green and blue upon the retina of the eye; see illustration below.

After shifting the eyes at regular intervals of a second each from one to the other of the black dots upon the two colors named, for a half minute, then suddenly looking at the black dot between the two, we will see a pure tint of red, which is produced by an equal mixture upon the retina, of a red-purple tint (the complement of green) with an orange tint (the complement of blue). This experiment plainly shows that the complement of red is a color which is an equal mixture of green and blue.

Maxwell, Church, and Rood all agree that blue and yellow are complementary, instead of blue and orange as advocated by Chevrenl. We think that bine and orange are complementary, and that the following experiments prove the correctness of our position; see illustration below.