Red and blue classic color scheme

Quick answer：

The red and blue classic color scheme refers to the combination of red and blue colors, which are often used together in various contexts due to their complementary nature. This color scheme is widely recognized and has been used in design, branding, and cultural symbolism. In design, red and blue are often used to convey energy and passion, while blue can represent calm and trust. The classic color scheme is particularly prominent in logos and branding, such as the Coca-Cola logo.