Why do eight characters have to be written in red paper?

Why are the later eight characters written in red paper? It is said that the eight characters are auspicious characters, so it is auspicious and beneficial for her to write in red paper. Therefore, Bazi is an impatient person. It is very useful for you to write him on red paper, which brings you luck, happiness and your wife. Therefore, the eight-character is a very auspicious word. With this word, you will make a fortune and be in charge, so you can say so.