Why is purple a symbol of emperors since ancient times?

1, purple is a noble and mysterious color. At all times, purple has always been exclusive to emperors. In the eyes of the ancients, purple is a symbol of good fortune, which can be compared with yellow, which represents the wealth of imperial power. In ancient times, purple was a symbol of nobility: the emperor was called "purple star", the imperial city was called "Forbidden City", the palace was called "purple terrace", and "purple gas" was used to refer to the emperor's gas. In ancient times, purple was also the most expensive dress. The ancient poem says that "Zhu Zi is an official", and the folk also often use "taking off the blue shirt for the purple robe" to refer to someone's promotion.

2. Emperors call themselves the Son of Heaven, and they are purple stars in the sky symbolizing the emperor. Therefore, in ancient China, purple was a noble color, which emanated from the emperor. There is a saying in China's ancient book Daoshu that "purple gas comes from the east".