Hard-pen seal calligraphy works can only be signed with famous seals, and the introduction chapter is generally strip-shaped, which is not harmonious if it is larger than a single word. Hard pen calligraphy seal is too small, which is quite a test of craftsmanship, and the selection of materials is better.
Brush seal project is relatively large, and its seal has a wide range of applications. In addition to the commonly used introductory chapter, there are also surname seals and leisure seals. The size of the seal depends on the length of the work, so calligraphers generally have the same seal size as the content.
Stamps are used as stationery printed on documents to indicate identity or signature. Generally, seals are dyed with pigments before printing. When printed on a plane without pigment, it is called steel seal, and some are printed on wax or wax paint and envelopes.
The oldest lettering in China is the stone carvings of Oracle Bone Inscriptions, Zhou and Qin in Yin. All words engraved on gold, copper, jade and other materials are called stones, and seals are included in stones. There is no conclusion as to whether the seal originated in Shang Dynasty or Yin Dynasty.
According to relics and historical records, it appeared at least in the Spring and Autumn Period and the Warring States Period and was widely used in the Warring States Period. At first, it was only used as a voucher for commodity exchange. After Qin Shihuang unified China, the scope of the seal was expanded to prove the rights and interests of those in power, and it was held by those in power as a tool to rule the people.