This sentence describes the forming conditions of blue and white porcelain in Ruyao. Azure can't be formed by itself, and the ancients can't change the humidity, so the moment when celadon is fired must be rainy and rainy, and the glaze color will gradually become dreamy azure. Therefore, porcelain after rain is extremely cherished. Waiting for misty rain in blue is the yearning and affirmation of a complete life. I am waiting for you like sky blue and misty rain.

It is said that the word came from Song Huizong, because the Ru kiln at that time was exclusively used by the Song royal family, and when the kiln official asked to name its color after the firing of Ru kiln porcelain was completed, the royal family approved: "It broke after the rain, so this color will be used in the future. This color can only be made when it rains and the sky blue clouds are gone. " From then on, azure is the color name of Ru kiln porcelain.