This is the scene where the local clouds thicken and the sunlight refracts. Because the clouds above are thick and the water vapor in the air reaches a critical state, when the angle of sunlight is low in the morning or evening, the water in the air absorbs more light with shorter wavelength, leaving only red light and orange light with longer wavelength to spread through the atmosphere, and the clouds will appear this pink purple after refracting the atmosphere.

The different colors in the sky are related to the fact that sunlight consists of visible light and invisible light, such as ultraviolet light. The wavelength range of visible light is 400-700 nanometers, and each wavelength corresponds to a color of light, so visible light is composed of countless kinds of light. What is usually said to be composed of seven colors is actually inaccurate. For example, red light is composed of various red lights.