Cool Colors- Blue, green, purple. These colors are associated with the cooling qualities of water and trees. Physiological research shows that our our heartbeat will slow, our temperature will decrease and our muscle will relax under blue and green lights.

Chromotherapy- "Healing with colors". In this practice, people are bathed with specific colored lights or meditate on specific colors to stimulate particular glands. This practice dates back to ancient Egyptians, Chinese, and Indians meditating in "color halls". Red is believed to stimulate physical and mental energies, yellow to stimulate the nerves, orange to stimulate the solar plexus and revitalize the lungs, blue to soothe and heal organic disabilities, green to exercise a calming influence and heal disorders like colds, hay fever and liver problems, and indigo to counteract skin problems and fevers. In the medical profession color therapy is not a typical practice, however, it is used for certain treatments, e.g. premature babies with jaundice are treated with exposure to blue light.

Interiors- The specific color of an interior is thought to have a big influence on human health and behavior. Bright colors, particularly when coupled with warm hues, seem conducive to mental alertness and activity and are therefore being used in schools more. Cooler, duller hues act as a sedative.

Examples:
In a study of the effects of environmental color on school-aged children, Henner Ertel found that the colors with the most positive intellectual effects were yellow, yellow-green, orange and light blue. Student's IQs increased by 12 points when surrounded by these colors. On the other hand, IQ scores fell when the students were surrounded by white, brown and black. Furthermore, the children were the most cheerful and sociable and least irritable in an orange environment.

Notre Dame's most famous football coach, Knute Rockne, painted the interior of Notre Dame's locker room red to excite and stimulate his players before a game. He painted the interior of the opposing team's locker room blue-green to sedate and relax the other team before the game and again at half-time.

In a factory where workers were complaining about being cold the management decided to change the color of the walls from blue-green to coral, rather than raise the thermostat. The complaints stopped.