Most oil hammer vases have a small mouth, a slender neck, a spherical body and a rounded base, looking like an oil hammer used in oil manufacture workshops, thus named. The whole vase body is glazed in light blue color, with slim crackles decorated on the glazed surface around the mouth and in part of the body, and the glaze color is fairly bright and smooth. On the spherical body there is a four-claw Jiaolong (an aquatic dragon in Chinese mythology) painted, surrounded by designs of clouds, mists and flames, looking considerably vivid and expressive. The vase is succinct with no more extra ornamental patterns on the surface, and overall the colors are gently blended. At the bottom, a circle of glaze layer is scrapped off with the inside exposed, and there is no inscription on the white-glazed base.
Under-glazed red color adopts copper oxide as colorant. The ceramic embryo is decorated with ornamental patterns and processed with clear glaze, and then fired through high-temperature reduction reaction. This approach to manufacturing painted porcelain, originally created in Yuan Dynasty, is extremely difficult; while it has been relatively popular for ages, it has still experienced ups and downs at different times. Under-glazed red ceramics firing technology enjoyed its peak during Yongzheng and Qianlong Period in Qing Dynasty. The oil hammer vase herein is of unadulterated colors and in excellent conditions.