Perhaps the most important theoretical research on color was proffered by Faber Birren, an acknowledged export on the effects of color on psychology and therapy. If not, just press . Blue is a restful and sedate color. Yellow is highly visible and serves many safety purposes. In the overall scheme of things, Birren said that the colors of the spectrum were associated with two moods.
Light colors are active.
Deep colors passive. With respect to mood, Birren said the most exciting colors were deep orange, scarlet, and yellow orange. The most tranquilizing colors were yellow green and green. And the most subduing colors were violet, and purple. Blue is considered by Birren to be the color of conservatism, accomplishment, devotion, deliberation and introspection.