What color is the imperial robe of Emperor China? Is it because "Zhu" that Ming Chengzu used Zhu color? What about Japan, Korea, Ryukyu and Vietnam?

Before the Tang Dynasty, kings and emperors had rules and regulations on what color robes to wear. During the Western Zhou and Eastern Zhou Dynasties, according to the Book of Rites, the laws and regulations at this time were specifically recorded? "Moon Order" records that the son of heaven "wears Tsing Yi". From the Warring States to the Qin, Han, Wei and Jin Dynasties, the "five elements" (fire, water, wood, gold and earth) prevailed. The first emperor of China, Qin Shihuang, wore a black robe according to the "five virtues" theory that water, fire, wood, gold and earth were matched with black, white, blue, red and yellow respectively. The rulers practiced the Kinder system, and red was the most expensive, so Di Chin wore a red robe. Later, the theory of "five virtues" was challenged, and some emperors no longer took the theory of "five virtues" as the only standard. Emperor Wen and Emperor Yang of Sui Dynasty wore yellow robes, but they did not explicitly prohibit others from wearing yellow robes. During Tang Gaozu's Wude period (6 18-626), yellow clothes were forbidden among officials, and yellow robes became the emperor's special clothing. The Book of the New Tang Dynasty, Volume 24, Che Fuzhi, says that in Tang Gaozu, the ochre yellow robe and the central belt are the official clothes, followed by the emperor's robes, which are slightly reddish and yellow, and are forbidden to be worn by subjects. It also stipulates the dress colors of other officials: purple for more than three products, Zhu for four products and five products, green for six products and seven products, and green for eight products and nine products. China has advocated yellow since ancient times, and the legends of "Nu Wa made man from loess" are recorded in Huainanzi, Shan Hai Jing and Taiping Yulan. The descendants of these "loess" are the descendants of the Yellow Emperor. The cradle of their growth and reproduction, the Yellow River, and the yellow land cultivated for thousands of years ... have made the Han nationality have an indissoluble bond with yellow since ancient times. The ancients believed that yellow was the color of the land, representing the unchangeable color of nature and the beauty of virtue. "Yellow is neutral, natural and eternal" (Ban Gu, White Tiger Yi Tong). So people use yellow to represent the "earth" in the five elements and the "middle" in the five parties. "Yellow is the positive color of the central soil." (Zhu) Yellow symbolizes the place where everything grows and represents the central imperial power and the country. Yellow has the symbolic significance of sacredness, dignity, loftiness and solemnity. Therefore, the ancient emperors all wore yellow robes and sat on the throne of Huanglong chair. All the decorations and carriages in the palace are also "yellow cars" and "yellow houses", as well as Taoism, which has a far-reaching influence on China culture.