It is impolite to write other people's names in red ink. Writing in red contains a meaning of breaking up, and a certain meaning of dying. Many people who write "blood books" have a heart of dying and show loyalty. Of course, this statement is unscientific, just a reference.

ancient yamen were also used. In the past, when a prisoner was executed, he used chicken blood as ink and wrote his name. Later, he gradually began to use a red pen. In many cases, people say that it is unlucky to use a red pen to write names, because the names written with a red pen were all people who had to be executed in ancient times.

Historical allusions:

In order to be able to sit firmly in the mountains and rivers, ancient emperors would inevitably use "destiny" to show their identity rationality, and the red pen to write things-"Dan Shu" was also a symbol of dignity. The "iron coupon of Dan Shu", which is often heard by everyone, is written with a red pen, so that the holder can be exempted from punishment.

Since the red pen was used by emperors and endowed with power, others naturally could not get their hands on it. The feudal dynasty had a clear class and paid attention to seniority, so no one but the emperor could use it, otherwise it would be guilty of "rebellion".