On Chinese Painting —— Why did China call Chinese painting Danqing in ancient times?

In ancient paintings in China, scarlet, azurite and turquoise are commonly used colors, so they are called "painters" to describe China's paintings.

Dan and cyan are two colors commonly used in ancient paintings in China, which refer to red and cyan pigments respectively.

Bamboo silk, Danqing painting. -"Wu Chuan"

You shan Dan Qing -"The Book of Jin Gu Kaizhi Biography"

Scarlet and cyan are commonly used in ancient paintings in China, so they are called "painters". The Biography of Hanshu Su Wu: "It was painted on bamboo and silk by Dan Qing." Du Fu's "Dan Qing to General Cao Ba": "Be loyal to your art, you don't know your age, and wealth is like floating on me." Folk call the painter "Master Dan Qing". It also refers to the art of painting, such as the biography of Gu Kaizhi in the Book of Jin: "Youshan Danqing."

Dan Qing: In the poems written by the ancients, the painter is often called the hand of Dan Qing. In fact, Danqing originally refers to temple sand and green wok, two mineral raw materials that are not easy to fade, so it is used to describe a person's outstanding achievements. At the same time, these pigments should be used in painting, so painters are also used to referring to painting art in general. In poetry, "the hand of Dan Qing" means the painter.