Why were Chinese porcelain's paintings mostly blue?

"Blue-and-white" porcelain was used in temples and occasionally in burials within China, but most of the products of the Yuan dynasty (1279-1368) appear to have been exported. Trade remained an ... Vessels, with numerous bands of decoration, were painted with Chinese motifs, such as dragons, waves and floral scrolls. read more

Therefore, he commanded the craftsmen in the nation to make such porcelain with the color of the sky after raining. Although it was difficult to fire this color. The craftsmen in Ruzhou finally made it. And ever since now, there are still many Chinese porcelain’s paintings blue. read more

Blue and white decoration first became widely used in Chinese porcelain in the 14th century, after the cobalt pigment for the blue began to be imported from Persia. It was widely exported, and inspired imitative wares in Islamic ceramics, and in Japan, and later European tin-glazed earthenware such as Delftware and after the techniques were discovered in the 18th century, European porcelain. read more

Jingdezhen was at first famous for white porcelain, but by the addition of cobalt, a blue colored porcelain was also produced. It is thought that cobalt for blue colors was introduced from the Middle East, and blue and white porcelain was highly prized there. read more