Sector seal is a special kind of seal, which is fan-shaped and can be used to print personal name, company name and other information. There is generally no fixed regulation or standard for the color of the sector seal, so it is not necessary to use red. According to personal preferences and needs, but the most important thing is to ensure the legitimacy and quality of the seal.

In China culture, red is considered to be auspicious, lucky and festive. Therefore, for a long time in the past, many people and institutions will choose to make their seals red to conform to traditional cultural concepts. In addition, red is the main color of China's national flag and emblem, so on some occasions, the use of red seals can also reflect the spirit of patriotism.