Huanglong and Wei Zi.

As far as I know, in China mythology, the dragons of other colors you mentioned generally appear as pets or livestock, except that the Qinglong has the function of the so-called oriental beast. For example, Zhu Rong and other ancient great gods expressed that there were several dragons on their hands, feet or ears. Then, for example, there are several dragons pulling carts for the son of heaven, including the saying that dragons are made by the son of heaven, which means that dragons are raised by the son of heaven, which almost means that dragons are animals of the son of heaven's family and there are people responsible for grazing. This representative should be the legendary Zhou Muwang. In addition, in the formal myth, golden and purple dragons may not appear. Because in the early culture of China, these two colors were not positive colors. Later, these two colors became the colors representing dignitaries, but there was no formal myth to explain the so-called functions of the related dragon species. As for expertise, it seems that the descriptions of dragons in China mythology are all described by Ba Long as a complete race, and there is no explanation about the expertise of dragons of each color.

There are also color descriptions, such as the so-called Nu Wa beheading the black dragon, the dragon in the cover of Jiuyi Kowloon Shenhuo in The Romance of Gods is red, and the little white dragon in The Journey to the West. Other descriptions of colors are not famous. From the impression, the black dragon generally represents a more fierce image. According to the relatively easy-to-find Mr.' s novel "Searching for Qin", the Qin Dynasty was more virtuous than water, and its color was still black, so the Black Dragon may represent nobility and auspiciousness in the Qin Dynasty, although this is the novelist's view.

In the above myths, except the little white dragon in The Journey to the West, the rest have nothing to do with the Four Seas Dragon King. But generally speaking, the dragon king is a golden dragon with five claws, although I don't know any official records.

In a word, the method of color classification you mentioned is probably created by DND in the west, that is, Dungeons and Dragons, and related settings and contents. Color classification is often used in the classification of western dragons (so-called lizards) in magic novels or games, film and television animation works. In China, according to the system, the most famous ones are probably the dragons in the series "Magic Heroes Invincible". They have different colors. Many magical writers in China are influenced by the description of the Queen Mother Dragon in this game.