**Seal Hammer**: A hammer-shaped tool used for stamping seal marks, commonly made from materials such as wood or metal. **Support Column**: A columnar tool that supports the vessel body, used to assist in stamping seal marks. Typically, the completed purple clay (zisha) unfired vessel is inverted and placed upon it, then the seal is struck onto the bottom using the seal hammer to form the seal mark. Usually made from wood or purple clay material.