Psychology of colours

Despite all this, there are some generally recognized associations between color and emotion. The chart below gives those associations and ways in which that color is used.

Red increases the pulse and heart rate, and raises your blood pressure. It increases the appetite by increasing your metabolism, which is why red is such a popular color in restaurants. It is active, aggressive and outspoken. One bank found that their lines moved faster when they increased the use of red in the bank lobby, and in a study of several hundred college students, a researcher found that they responded more quickly to cues under red light than under green light.

Source

The Psychology of Color