With the diversification of security and anti-counterfeiting measures, various new anti-counterfeiting technologies have emerged in an endless stream, showing a situation in which flowers bloom in full bloom. The key to an anti-counterfeiting technology is to extend the timeliness and uniqueness of the anti-counterfeiting technology, which is also the goal pursued by the anti-counterfeiting technology. The anti-counterfeiting technology mainly includes: anti-counterfeiting of printing design, anti-counterfeiting of printing paper, anti-counterfeiting of printing ink and anti-counterfeiting of printing process. Among them, the development of printing ink anti-counterfeiting technology is very good, and the application range is becoming more and more extensive. 1. Anti-counterfeiting principle of achromatic ink The so-called anti-counterfeiting ink is a special printing ink made by adding special properties of anti-counterfeiting materials to the ink binder and processed by a special process. Anti-counterfeiting inks are mainly divided into the following types according to their anti-counterfeiting functions: ①Magnetic security ink ②Fluorescent ink and phosphorescent ink ③Reactive color-changing ink ④Anti-tamper ink ⑤Daylight excited color-changing ink ⑥Intelligent security ink ⑦Infrared ink ⑧ Nano ink Among them, reactive color-changing ink is an important part of anti-counterfeiting ink, and can be divided into: thermal-sensitive color-changing ink, photosensitive color-changing ink, moisture-sensitive color-changing ink, pressure-sensitive color-changing ink, etc. Reaction color ink is to add a variety of chemical substances added to the ink, under certain conditions (such as light, heat, humidity, pressure, etc.), various chemical reactions can occur, so that the ink changes color and achieves anti-counterfeiting purposes. The decolorizing ink is a branch of reactive color changing ink. The decolorizing ink is an ink that easily fades or dissolves when it encounters water or chemicals. 2. Classification of achromatic ink ①Water decolorizing ink Water decolorizing ink is also called moisture sensitive ink. The principle of anti-counterfeiting is that the color material contains substances whose color changes with humidity. It can be decolorized with water or bleach. Generally, it is a water-soluble substance containing oxidant or reducing agent. The anti-counterfeiting feature is that the dry state is colorless, and the wet state becomes colored. Water decolorizing ink is divided into three types: reversible decolorization, irreversible decolorization, and humidity sensitive diffusion. It has four colors: blue, green, black, and red. ◠The color of the reversible decolorizing ink drops from colored to colorless after dripping, and the original color is restored after the water droplets volatilize. The color changes from white to none, only silk screen and gravure printing. If screen printing is recommended to use 200 mesh screen printing, the thicker the better. ◠Irreversible decolorizing ink: It is an oil-based ink, which changes from colored to colorless after dripping. After the water droplets volatilize, the color no longer returns to its original color. The color is black → none, red → none, blue → none, green → none. Only screen printing and gravure printing are required. The printing should be thinner, with bright colors and good fading effect. For screen printing, 350-420 mesh screen printing is recommended. ◠Moisture-sensitive diffusion is irreversible, the colors are red, yellow, blue, green, etc., and can only be printed with water-based screen. ② Organic solvent decolorizing ink For example, alcohol, gasoline, benzene, etc. The principles of organic solvent discoloration and water discoloration are basically the same, and they are discolored according to the mutual reaction of corresponding chemical substances. ③Composite achromatic ink The combination of water decolorization ink and organic solvent decolorization ink can be called composite decolorization ink. The composite decolorizing ink can react with water-based solvents, bleaching and organic solvents to achieve the purpose of decoloring. Generally speaking, weak bleach can remove the printing on the passport and water-soluble pen ink. If you want to remove all or part of the ballpoint ink, you can pass an organic solvent. However, these solvents are unlikely to have an effect on all printing and pen inks. Among them, black ink is based on carbon, and general solvents cannot decolorize them. Compound achromatic ink is a manifestation of the development trend of anti-counterfeiting ink, because composite anti-counterfeiting ink can not only extend the service life of anti-counterfeiting ink, but also improve the anti-counterfeiting effect. ④Binary anti-counterfeiting ink Binary anti-counterfeiting ink refers to the fact that the decolorizing ink contains fluorescent components, which can be easily distinguished as whether or not a solvent has been used under the irradiation of ultraviolet rays. Accordingly, some faded inks contain visible faded components and possess permanent fluorescent components. Under visible light irradiation, these inks do not seem to exist at all, but when exposed to ultraviolet light, they can be observed by the human eye. Many printing inks lose their fluorescence when they are bleached. Therefore, we can use fluorescent inks as a feature to check whether they have been bleached or not. 3. Application of achromatic ink At present, water erasable ink is a more commonly used ink, which is often used as the background of the signature part of the document, and is used below the number that is easy to change. In addition to the decolorizing ink as the background color, when the substrate is bleached, a chemical reaction may occur to cause brown spots. In the documents that need to be identified, such as the photos on the passport, there is a composite laminate between the substrate and the foil used to wrap the material, and the water erasable ink is printed on the inner surface of the foil, so that you can detect whether it is There is water. Many waterproof logos are logos printed with water-clearing ink, and they are affixed to a part inside the phone's main unit or outside the battery. When this kind of logo is not exposed to water immersion or humid gas, the edges of the picture and text are clear and will not fade or change color. After encountering water, the edges of the picture and text will diffuse in color and cannot be restored. It can be used as a mark for the transportation, storage and use of electronic devices and other products. At present, many mobile phone manufacturers have adopted this high-quality waterproof logo. This sign can also adjudicate some claims issues and provide corresponding scientific basis. In short, due to the increasing level of counterfeiting and forgery of tickets and product trademarks, the new anti-counterfeiting technology has been promoted, and it is required to quickly, cheaply and accurately reveal the authenticity of the anti-counterfeit objects. The role. Achromatic inks also came into being. Although the current erasable ink has been greatly developed and applied to life, due to the preparation and inspection conditions of the erasable ink, it can not be widely used in any field like other inks. However, with the continuous advancement of technology, many difficulties will be solved, we believe that this very easy to use anti-counterfeiting method will become an important part of anti-counterfeiting technology. Toothbrush For Children Children'S Toothbrush,Soft Bristle Children Toothbrush,Children Classic Toothbrush,Children Toothbrush Yangzhou Buyone Brush Industrial Co., Ltd. ,