Analysis on special ink anti-counterfeiting technology for RMB printing

Ink is the main medium for printing. The ink color is used to reflect the technology and quality. In most countries, the ink of the banknote is bright and not strong, the pattern lines are thin, the ink layer is thin, and it is bright and clean, the ink and paper have good affinity, and the ink tone Coordination is very coordinated. Anti-counterfeiting ink is a special printing ink made by adding a special performance anti-counterfeit material to the ink connecting material and processed by a special process. Ink anti-counterfeiting is simple to implement, low cost, good concealment, colorful, easy inspection and strong reproducibility. It is the preferred anti-counterfeiting technology for banknotes, tickets and trademarks in various countries. Printing inks are specially developed, and China's renminbi uses a variety of security inks during the printing process.

1, light change ink

Light change ink is one of the most effective high-tech anti-counterfeiting inks available today. The printed pattern has a lustrous metallic luster. With the change of human eye angle in natural light, two or three different colors will appear, and the color difference will change significantly. For example: red-green, green-blue, red-gold, etc. The pattern can not be duplicated by a high-definition scanner, color copying machine or other equipment, and the anti-counterfeiting property is extremely strong; and the light-variable ink has the advantages of easy recognition, good persistence, simple use method, wide application range, non-toxicity, no radiation, etc. World recognized high security security ink. The denominations of the front left and bottom of the fifth set of RMB 100 and 50 are printed with light-variable ink. When viewed perpendicular to the ticket, “100” is green, “50” is gold, and when tilted at a certain angle, it becomes Blue and green.

2, fluorescent ink

Fluorescent ink is a special ink that emits visible light (wavelength 400-800μm) under the irradiation of ultraviolet light (wavelength 200-400μm). According to whether the color of the printing ink is divided into two kinds of colored fluorescent ink and colorless fluorescent ink. The former is the addition of a fluorescent compound to a colored ink, the latter being added to a colorless ink. The former print is visible to the naked eye and the latter is invisible. In the fifth set of renminbi, colored fluorescent inks and colorless fluorescent ink printing patterns were used. For example, the red lines in the elliptical pattern on the back side of the 100 yuan backside adopt colored fluorescent inks, which show bright orange under a certain wavelength of ultraviolet light; the middle of the back side of 20 yuan shows a green fluorescent pattern under ultraviolet light of a specific wavelength. In the 100 yuan, 20 yuan in the underlined underneath the offset printing shading at the specific wavelength of ultraviolet light can be seen under the "100", "20" words, the pattern is printed using colorless fluorescent ink for machine-readable.

3, magnetic ink

Magnetic anti-counterfeiting inks are anti-counterfeit printing inks made of magnetic powder materials (cobalt oxide and iron oxide, etc.) as a functional component. It is the most commonly used anti-counterfeiting ink. Its outstanding feature is its deep appearance and color, and its simple detection equipment. It is mainly used to print magnetically encoded words and symbols of bank tickets, has the effect of recording and storing information, and will be printed with magnetically encoded tickets. In the magnetic code reader can identify authenticity. The positive numbers on the fifth set of renminbi are printed using magnetic ink.