Blue is the colour of the sky and sea. It is often associated with depth and stability. It symbolizes trust, loyalty, wisdom, confidence, intelligence, faith, truth, and heaven.
Blue is considered beneficial to the mind and body. It slows human metabolism and produces a calming effect. Blue is strongly associated with tranquility and calmness. In heraldry, blue is used to symbolize piety and sincerity.
Blue is a masculine color; according to studies, it is highly accepted among males. Dark blue is associated with depth, expertise, and stability; it is a preferred color for corporate America.
Avoid using blue in dining rooms, because blue suppresses appetite. When used together with warm colours like yellow or red, blue can create high-impact, vibrant designs; for example, blue-yellow-red is a perfect colour scheme for a superhero.
Source: Color Wheel Pro