What does purple gas from the east mean?

Purple gas comes from the east, and the idiom is pronounced as: z ǐ q ǐ d ǐ ng lá i.

It is said that before Lao Tzu passed Hangu Pass, Guan Yinxi saw purple gas coming from the east and knew that saints would pass by. Sure enough, I came riding a green cow. This old metaphor is a symbol of good luck.

The idiom comes from Han Liuxiang's Biography of Youxian: "I went west and saw the purple floating customs in the shade, but I rode a green cow."

Synonyms are: colorful, solid color and purple, purple and yellow.

The antonym is: ominous.

Idiom sentence-making: He has experienced many misfortunes for decades, and now he is only operating the purple gas from the East once.