In ancient times, red pens were used to record the crimes of some suspects or to bet on the death penalty. In the past, the emperor used a vermilion pen to approve the memorial, which was called Zhu Pi. No one can give instructions in scarlet letters except the emperor.
Usually, people who have passed away will write their names in red pen. That's what it looks like on the tombstone. Always paint them red. For this reason, writing someone's name in red in normal life is an infringement on others.
The relationship between ancient names of people in China and Chinese characters;
In history books or ancient books, we can often see that the ancients had characters besides names. The ancients had "names" and "characters", and "names" were also called "real names". The old saying goes that an ancient baby was named by his father three months after birth (of course, some people said that they could take a name after birth); The word "Zi", also called "Biao Zi", is a name associated with the real name besides the real name.
When a man was crowned at the age of 20, he took the words (but in the troubled times of the Three Kingdoms, he was rebellious and didn't necessarily follow the rules. Cao Chong and Sun Liang were both crowned after death, but both had characters), while women took characters when they were crowned at the age of fifteen. Names existed before the Xia Dynasty, and word selection is said to have started from the Shang Dynasty. For example, the overthrown Shang Tang, formerly known as Lu, was also known as Tianyi and the word Tang. Also, there is a difference between a name and a character. The ancients often claimed their own names to show humility, called people's words to show respect, and the combination of surnames and words was also a kind of respect.