John L. King, Color mixing guide (1923)
“ People who are less refined admire deeper tones; yet want absolute harmony, while coarse individuals are satisfied with bright gaudy colors. Color is a sensation produced on the retina of the eye, by the action of one or more of the elements of light. Exact proportion by parts are not given in the following in order to let you be the judge of the exact shade. Follow the simple rule of using a little more of the dark colors of each color combination if a deeper shade is wanted and vice versa for a lighter one. ”
