Red. Do you like this colour? According to SensationalColor.com red increases enthusiasm, stimulates energy and can increase the blood pressure, respiration, heartbeat, and pulse rate. It encourages action and confidence, and provides a sense of protection from fears and anxiety. Red is the highest arc of the rainbow and is the first colour you lose sight of at twilight.
Less than 2% of the population has red hair and they are often portrayed as having fiery tempers.