Its energy has a strong influence on the growth of plants. Psychologically red is exciting and increases restlessness and nervous tension. Under the influence of red, time is over-estimated, and weights seem heavier. In practical applications 'pure' red can seldom be used. The full color is too overbearing and has too strong an after-image.
Brilliant red is good for commanding attention.
In its crimson tone it benefits those who worry and are fearful. Its vermilion shade will help to counteract depression and help to inspire action to solve the problem. The most easily recognized and identified color and the easiest to see in daylight conditions. A bright red attracts attention to itself and will take a lot of dirt without losing its appearance. Yellowish reds have better visibility than bluish reds.