Is the purple arch photo an idiom?

Wei Zi Zhao Gong is not an idiom. The idiom containing purple is: purple gas comes from the east, and the specific explanation is as follows:

Pinyin [dnglá i]

Explain purple gas: auspicious gas. Refers to auspicious arrival or sage arrival.

Synonyms are colorful, purple yellow and purple purple.

Stroke of Chinese characters

Antonym ominous sign

spell

Explanation: Auspicious. Omen: an omen. A bad omen.

Synonyms are ominous and disastrous.

The antonyms are good luck, good fortune, good fortune and good reputation.