In the official seal of Sui and Tang Dynasties, the expansion of seal surface and the adoption of Yang seal provided rare objective conditions for getting rid of Chinese seal and creating new aesthetic forms. The use of Yang Wen's seal script on a large printing surface four or five centimeters square is the basic feature of the official seal of Sui and Tang Dynasties. This can fully show the line meaning of seal script calligraphy and create a sense of spaciousness as a whole. It can be seen from the official seal of Sui and Tang Dynasties that the new seal has the same characteristics: the lines of the seal stretch smoothly and the layout is dense and sparse.
Zhu's lines are even and straight; White text printing does not need to fill in the blanks with double tick marks, and thick lines can be used, but attention should be paid to the changes of brush strokes.
The period from Sui and Tang Dynasties to Song and Yuan Dynasties, and even the Southern and Northern Dynasties, was the relatively low tide of China's seal art, and there were few official seals in Sui and Tang Dynasties. The Sui Dynasty was short-lived, and the system of the Tang Dynasty was recorded in the Song Dynasty's Record of Retirement from the Dynasty in the Spring, Autumn and Ming Dynasties, which stipulated that the seal should be turned over. They were all Yuan Wailang sent to the Ministry of Ritual. The characters were first broken on the big stone in front of the hall and then destroyed, so there were fewer Tang seals handed down from generation to generation. Before the Qing Dynasty, there was little information in this field. Qu Zhongrong's Collection of Ancient Official Seals in the Qing Dynasty contains more than 100 official seals since the Tang Dynasty, but there is only textual research and no seal. 19 16 There are more than 280 records of Luo Zhenyu's official seals since the Sui and Tang Dynasties, and there are special books on official seals since the Sui and Tang Dynasties.
The official seal of Sui and Tang Dynasties is characterized by an obvious increase in volume, generally 5 to 6 cm square. Another feature is the use of Zhu Wen, because after the Northern and Southern Dynasties, paper replaced bamboo slips, abolished the mud printing system, and began to directly cover paper and silk with printed colors. When printed on paper and silk, Zhu Wen has better clarity than Bai Wen. Due to the large paper area, the printed surface is naturally much larger than that in the Han and Wei Dynasties. With the expansion of scale, the exquisite Zhu seal is easy to be lost, so the official seal after Sui and Tang Dynasties gradually separated from the style of Chinese seal. In order to pursue the unity of composition, the early "ten-fold seal script" germinated by enriching the curved and coiled strokes.
The official seal of Sui and Tang Dynasties is based on the standard seal script, which is simple and vigorous, natural and smooth, relatively free in posture, simple and vivid. That is to say, unlike the Han and Wei Dynasties, which were full of paintings and paintings, the turning angle was very clear, and unlike the official seals after the Song and Yuan Dynasties, the printed sidebar was basically the same as the seal, which was harmonious and unified on the whole and had certain artistic value.