1, Tang Shu: This is the most common form of signature, indicating that the work is from Longwentang.

2. No money: some of Long Wentang's works are not marked with the name of the producer. In this case, we can only judge their authenticity in other ways.

3. Celebrity money: This kind of money is generally written by famous pot-casting masters or national treasures, and has high collection value.

4. Commemorative funds: for example, the anniversary of the founding of the school, the anniversary of marriage, the commemoration of merger, the investigation of state affairs, and the ceremony of the emperor's accession to the throne. These are special commemorative styles.