Blue and white porcelains, also known as white ground blue and white porcelains, are made of cobalt oxide containing cobalt ore as raw materials, painted decorations on the body of the ceramics, covered with a transparent glaze, and fired at one time by high temperature reduction flame. The cobalt material is blue after firing. It has the characteristics of strong dyeing power, bright color, high firing rate and stable color. At present, the earliest specimen of blue-and-white porcelain was found in Tang Dynasty; mature blue-and-white porcelain appeared in Yuan Dynasty; blue-and-white in Ming Dynasty became the mainstream of porcelain; and it reached its peak in Kangxi period of Qing Dynasty.
Blue and white porcelain is rich in shape and has everything. Besides daily life utensils such as bowls, plates, dishes and calves, there are also wine utensils, tea sets, stationery utensils, furnishings, sanitary utensils, lighting utensils, sacrificial utensils, underworld utensils and religious statues.
Blue and white porcelain began in Tang Dynasty and developed rapidly in Yuan Dynasty. It reached its peak in Ming and Qing Dynasty. Especially in Kangxi and Qianlong Periods of Qing Dynasty, the production technology, enamel texture and picture decoration of blue and white porcelain were very concerned, even to the point of doing things personally, which made the production technology of blue and white porcelain of Qing Dynasty reach a new height. The blue and white decoration of the folk kiln is more vivid, diversified and full of life. There are many historical themes and opera story paintings.