An innovative bottle style first fired in Jingdezhen during the Kangxi reign. It features a small mouth, a straight neck forming a tubular shape with the opening, and a rounded belly. The overall shape resembles an oil-pressing hammer, hence the name. Most examples are decorated with blue-and-white (qinghua) or monochrome glazes, while the iron-red (fanhong) cloud-and-dragon design is a rare variant
