Bright red and true red are different shades of red, but their difference lies in the brightness of hue. Bright red refers to bright red, usually with high saturation and lightness, giving people a warm and vivid feeling. Zhen Hong refers to soft and dim red, usually with low saturation and lightness, giving people a sense of stability and solemnity. There are some differences in the use of these two red colors. Red is often used in festive occasions, such as weddings and festivals. Zhen Hong is usually used for formal and solemn occasions, such as national flags and ceremonies.