It is understood that the interference type optical variable ink used in banknote printing is the most complicated new type of anti-counterfeiting ink, which has pearl-like luster and metal effect. This special feature allows the ink mark to tilt under natural light at a certain angle to At a certain angle, the pattern is shifted from one hue to another, causing the color to change. The 2005 version of the 100 yuan renminbi used this technology, the vertical angle of the face is observed as yellow-green, tilted to a certain angle to become dark green, these dynamic color change effects are also the most convenient and quick means of identification by the renminbi holder. Moreover, the ink technology is complicated in process and cannot be reproduced by using a high-definition copying machine and a color scanner, and the forgery is low.

Another anti-counterfeiting ink is a fluorescent ink. It is a product of a combination of various compounds with a UV absorber resin. The number on the upper left side of the renminbi will show the rectangular "100/50/20/10/5" under ultraviolet light and emit orange-yellow fluorescence. In contrast, the counterfeit banknotes are dim under ultraviolet light.

Various ingenious printing

The layout of banknotes is mostly based on characters, landscapes, paintings, architecture, etc., and is printed with complex and variable shading. Printed anti-counterfeiting technology mainly uses lithographic offset printing and gravure printing.

The printing of the main scene is mainly realized by the method of hand-engraved gravure printing. The gravure printing uses a high-precision metal gravure hand-engraved by the engraver. The printed pattern of the plate is in a three-dimensional pattern and floats on the paper surface. The stereoscopic effect is strong and the layers are distinct. The hand touched the bump.

According to reports, in the latest version of the 100 yuan RMB face, positive Mao Zedong head, national emblem, "People's Bank of China" line name, upper right corner denomination figures, Braille and the back of the Great Hall of the People are all engraved and embossed, touched with fingers Obvious concavity. For example, Mao Zedong's head, the touch of the hand is obvious, especially the hair and clothing decoration parts, under the magnifying glass, the lines of ink stand on the paper. Relevant experts believe that hand-engraved gravure is also an anti-counterfeiting method that is easily identifiable by the public and is not easily copied. Because of the individual's knives, styles and uniqueness, the hand-carved plate making is difficult to imitate the depth, curvature and angle of the engraving lines. It is difficult for the author himself to engrave two identical versions, so until now Gravure printing is also an indispensable means of anti-counterfeiting of national banknotes.

Gravure can also realize a printing technique of refraction latent image, which uses two different gravure lines to make different light tilting effects, and two kinds of graphics are formed in the same part of the paper. When this kind of graphic is viewed from the light source, it is a kind of graphic. If the paper is rotated horizontally by 45 degrees or 90 degrees, it will be transformed into another graphic. China's fifth set of 100 yuan yuan on the upper right side of the elliptical group of flowers, through the above angle of rotation, the invisible denomination number "100".

The lithographic offset printing is used to print complex and variable shading of banknotes. The lithographic offset image and paper surface are almost in the same plane. Most of the prints we see use this technology, but lithographic offset printing also has printing techniques that are difficult to copy, such as lithographic offset printing technology, which is a very accurate High offset printing technology is generally difficult to copy. This technology puts extremely high requirements on offset precision for the printing and pattern docking, which is a great test for the precision of the printing press and the technology of the printer.

It is understood that the latest version of 100 yuan is the use of lithographic offset printing technology, the face of the front left and the bottom right side of the face have a partial number of "100". In the light transmission observation, the front pattern constitutes a complete denomination number "100". (Editor: Pang Junqi)

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