Color coordination of red and blue

Quick answer：

Color coordination of red and blue is a topic in the field of graphic design and fashion. Red and blue are complementary colors, meaning they are opposite each other on the color wheel and create a striking contrast when used together. This combination can evoke a wide range of emotions and is often used to convey energy, passion, or excitement. In design, it's important to balance the two colors to avoid harshness and to ensure the composition is harmonious.