First, the silver ticket paper.

For example, in the Song Dynasty, Sichuan paper was specially used to print money, and private purchases were not allowed.

Second, the complex model.

The pattern of Jiaozi in the Northern Song Dynasty consists of "wooden figures in the room" with decorative borders outside. The graphics are complex and counterfeiters are not easy to imitate. It is an effective anti-counterfeiting method to add "auxiliary household characters, each with a secret title number and an initial ink knot"

Third, multi-color overprinter.

"Jiaozi" printing has begun to overprint red, blue and black patterns and official seals for security and anti-counterfeiting. This is probably the beginning of two-color and multi-color overprinter.

Fourthly, internal encryption and watermarking technology.

In Qing Dynasty, Shanxi merchants used encryption technology to prevent counterfeiting. For example, 300 sets of encryption in Rishengchang Bank in 1995 were changed from 1826 to 192 1. According to historical records, there has never been an impostor. Steganography and endorsement, the technical anti-counterfeiting measures adopted by Shanxi merchants more than 0/00 years ago, are still used in banking business. Shanxi merchants also designed micro-carved seals for anti-counterfeiting. The anti-counterfeiting function of this micro-imprint stamp belongs to micro-imprint anti-counterfeiting. The content of the micro sculpture is a complete article of Wang Xizhi's Preface to Lanting, with 340 to 50 words. The carving is very fine and requires a very high level of carving. At that time, Shanxi merchants even began to use watermarking technology to ensure the security of the draft. Of course, this is the original watermarking technology. The draft number has been strictly managed, and no used draft has been lost.

Verb (abbreviation for verb) manual intervention

Due to the relative lack of technology, the government attaches great importance to the establishment of private professionals, and a large number of people verify the authenticity. And passed legislation to impose capital punishment on counterfeit banknotes. The words "the forger is put to death (beheaded)" can be seen on the banknotes unearthed in the Song Dynasty.