[Printing Factory] Ink is the main medium for printing, and the ink color is used to reflect the technology and quality. The ink color of most national banknotes is bright and not dense, the lines of the patterns are thin, the ink layer is thin, it is really smooth, and the affinity of ink and paper Well, the tone of the ink is very coordinated. Anti-counterfeiting ink is a special printing ink made by adding special performance anti-counterfeiting materials to the ink connecting material and processed by a special process. Ink anti-counterfeiting has simple implementation, low cost, good concealment, bright colors, convenient inspection and strong reproducibility. It is the preferred anti-counterfeiting technology for banknotes, tickets and trademarks in various countries. Banknote printing inks are specially developed. my country's RMB uses a variety of anti-counterfeiting inks in the printing process.

1. Optical variable ink

Light-variable ink is one of the effective high-tech anti-counterfeiting inks today. The printed pattern has a metallic luster with ambilight. Under natural light, with the change of the human eye perspective, it will show two or three different colors, and the color difference changes significantly. For example: red-green, green-blue, red-gold, etc. Patterns cannot be copied with high-definition scanners, color copiers or other equipment, and are extremely anti-counterfeiting; and optically variable inks have the advantages of easy identification, good durability, simple use, wide application range, non-toxic, no radiation, etc. World-recognized high-security security ink. The fifth set of RMB 100 and RMB 50 denomination numbers on the lower left side of the front are printed with light-variable ink. When viewed perpendicular to the ticket surface, "100" is green, "50" is gold, and when inclined at a certain angle, it becomes respectively Blue and green.

2. Fluorescent ink

Fluorescent ink is a special ink that can emit visible light (wavelength 400-800μm) under ultraviolet light (wavelength 200-400μm). The printing plant is divided into colored fluorescent ink and colorless fluorescent ink according to the color of printing ink. The former is to add the compound with fluorescence to the colored ink, the latter is to add to the colorless ink, the graphics printed by the former are visible to the naked eye, the latter are not visible. Colored fluorescent inks and colorless fluorescent inks are used to print patterns on the fifth set of RMB. For example, the red stripes in the elliptical pattern above the main scene on the back of 100 yuan use colored fluorescent ink, which shows a bright orange-red under a specific wavelength of ultraviolet light; the middle of the back of 20 yuan shows a green fluorescent pattern under a specific wavelength of ultraviolet light ; At 100 yuan and 20 yuan, under the front row name offset printing shading, under the specific wavelength of ultraviolet light can see "100", "20", the pattern is printed with colorless fluorescent ink for machine readable.

3. Magnetic ink

Magnetic anti-counterfeiting ink is an anti-counterfeiting printing ink made by using magnetic powder materials (iron oxide and cobalt doped with iron oxide, etc.) as a functional component. It is a frequently used anti-counterfeiting ink. Its outstanding features are its deep color and simple detection equipment. It is mainly used to print magnetically encoded text and symbols of bank tickets. It has the effect of recording and storing information. The ticket is put into the magnetic code reader to identify the authenticity. The positive numbers on the fifth set of RMB are printed with magnetic ink.