Hong Miao-China used to practice brush calligraphy. It was red. Every other page is in red standard script with a thin layer of transparent paper on it. Practitioners draw scarlet letters.
Because of their young age and imperfect hand-eye coordination function, it is difficult for young children and new school children to write standard fonts, and once they develop incorrect writing habits, it is difficult to change them. Hong Miao is due to the standardization of copybooks.