This instrument has a mouth, neck tied, shoulders slipped, abdomen bulged, and feet ringed. It belongs to the kiln to change the glaze, and the ware has an unexpected glaze effect during the firing process. As the kiln contains a variety of color elements, which are sufficient after oxidation or reduction, the porcelain may exhibit unexpected glaze effects after being discharged from the kiln. Because the kiln changed glaze appeared accidentally, the shape was special, and people didn’t know the principle. It was only due to the changes in the baking process in the kiln, so it was called "kiln changed glaze". Unpredictable and unique. The porcelain is blue and red, giving people a sense of unpredictability. Book at the bottom of the bottle: Yongzheng Year System