1, the ancient rulers fabricated the so-called "heavenly book" and said that it was written in Dan pen, so it was called "Dan book", which was taboo for the people; 2. The preferential cards issued by ancient emperors to heroes are often written in "Dan Shu", and the exemption cards are also written in red ink;

In ancient times, the names of criminals were recorded in calligraphy;

4. The names of ancient sentences are all red;

5. Ancient tombstones are written in red;

6. It is said that Hades hooked the book of life and death with a cinnabar pen;

7. Legend has it that signing with a red pen is a curse for others to die;

8. Criminals who are now sentenced to death shall mark "X" or "√" with a red pen;

10, if you communicate with friends, it means breaking up;

1 1, the doctor cancels the order;

12, Interpol now calls the most wanted man a red wanted man.