Klein Blue is a shade of blue, often used in art, design, and interior design. It is a deep, vivid blue that is known for its beauty and rarity. In color schemes, Klein Blue is often paired with complementary colors like orange or red to create striking contrasts. The color's name is derived from the German chemist and mineralogist Heinrich Klein, who discovered it in 1884. It has been used in various artistic movements, including Expressionism, and is considered a classic color choice in design.