Red and blue dark and light color scheme

Quick answer：

Red and blue dark and light color schemes are often used in design to create a sense of contrast and depth. Red is a warm color that can evoke emotions like passion and energy, while blue is a cool color that can convey calmness and professionalism. Dark and light shades of these colors are used to highlight key elements or create a visual hierarchy in design. In marketing, these color schemes can be used to attract attention and convey different messages depending on the brand and context.