Where is the origin of this sentence "clouds open after rain, and this color makes the future"?

It is said that the Ru kiln in Song Huizong was used exclusively by the Song royal family at that time. When the kiln official asked Song Huizong to name its color after the firing of Ru kiln porcelain was completed, the royal family approved it: "After the rain clears, this color will be in the future." From then on, azure is the color name of Ru kiln porcelain.

The Song Dynasty was the earliest minimalism, and the ancient aesthetics reached its peak in the Song Dynasty, requiring absolute minimalism, that is, simplicity of circle, square, plain color and texture. Song people painted with ink and fired monochromatic glazed porcelain.

Extended data:

"After the rain, the sky is clear, so the color will be in the future." It is used to describe Song porcelain. The Song Dynasty was the heyday of China porcelain, with five famous kilns, namely Ding, Jun, Guan, Ge and Ru kilns. Among the ancient porcelains in China, Song porcelain is unique in the history of China ceramics because of its elegant shape, pure glaze color and exquisite pattern.

Like a hat bowl, the lines are simple but full of tension. At the same time, although the Song Dynasty porcelain was mostly monochrome porcelain, it had a great feature that other dynasties' porcelains could not match, that is, seven points of labor and three points of nature. If it was in the Ming and Qing Dynasties, landscape paintings were usually used to express landscapes on porcelain, but in the Song Dynasty, porcelain was made with poetic interest.