The latest research on security ink

Photochromic ink

1. UV ink

UV inks include colorless (invisible) and colored (visible) fluorescent security inks.

2. Colorless fluorescent ink

It is colorless under sunlight, but shows a clear fluorescent color under ultraviolet light irradiation. There are red, green, yellow and blue four colors. UV light or strong sunlight and fluoresce after the emergence of fluorescent effects. This series of inks is colorless under normal light and shows color under direct sunlight of ultraviolet light or strong light, and fades after the light source is withdrawn.

3. Colored fluorescent ink

The color can be observed under daylight conditions, but clear fluorescent colors appear in various colors under ultraviolet irradiation. The series of inks are colored under normal light, and the color light source is evacuated from the back light under the direct light of ultraviolet light or strong sunlight. However, the underlying material using fluorescent inks cannot contain brighteners.

4. Standard fluorescent ink

1Present a color under the irradiation of long and short wavelength ultraviolet light Advanced anti-fake fluorescent ink can show different colors under the irradiation of different wavelengths of ultraviolet light.

2 It responds only to short-wavelength (254 nm) UV light and does not react to long-wavelength "365 nm" UV light.

3 double reactions: Two different colors were visualized under long (365 nm) and short (254 nm) UV irradiation. Suitable for UV and traditional lithography, flexo, gravure and screen printing.

5. UV/Infrared ink

This type of ink combines the features of UV and IR inks. A bright green fluorescent light is displayed with 984 nm wavelength infrared light, and the selected color appears under UV light irradiation. Suitable for uZ and traditional lithography, flexo, gravure and screen printing. Provide a variety of different detection equipment: infrared detection pen 980nm laser pen or LED detector and UV detector. Primary Explosive Ink-Proof Inkjet Machine-readable Ink Labeling System Markless Product Identification System for UV and traditional lithographic, flexographic, gravure, and screen printing applications.

6. Infrared ink

The range of infrared inks is much narrower than UV inks. Bright fluorescent green light appears at a specific wavelength of 980 ns. Infrared oil can be a colorless material, but detecting an invisible ink during printing can be a problem. A small amount of brightener can be added to the ink for testing during the printing process. The infrared ink may also be a colored material. The color that appears when irradiated with infrared light depends on the color of the ink itself. Suitable for uv and traditional lithography, flexo, gravure and screen printing.

7. Optical color ink (0V1)

This series of inks is colorless under normal light and displayed under ultraviolet light or strong sunlight. The color light source fades after it is withdrawn. Beijing Banknote Printing Plant Zhongrong Ink Co., Ltd. (hereinafter abbreviated as “Zhongrong Ink”) developed and developed the highest-end water-imprinting gravure gravure printing ink and optical color-shifting ink (OVI) technology in the printing ink industry in the world today. Fluorescent, infrared light conversion 'magnetic, temperature change, light change, mirror color and other anti-counterfeiting inks. While maintaining the original light-transformation effect of ovr, the printed product can be observed at different viewing angles under natural light or light. The effect of color change can be observed through a special lens, and the same pattern exhibits two completely different colors. At present, nearly 100 countries in the world use OVI to print banknotes. The results of international criminal organizations’ statistics show that all counterfeiters cannot imitate OVI printing effects. With the improvement of the awareness of anti-counterfeiting inks such as OVI, the trend of printing certain high-end premium products is expanding. Suitable for water-based gravure printing and water-based screen printing.

8. Laser hologram identification combined with fluorescent encryption security ink

Its anti-counterfeiting function is mainly reflected in the complexity of the process. Shows special colored fluorescent images under UV light, featuring abrasion resistance, heat resistance, convenient detection, accuracy, and strong anti-counterfeiting. Laser holograms have been widely used in trademarks, corporate logos and other fields. China has now researched and developed a laser holographic identification secondary encryption integrated anti-counterfeiting technology.
Thermal color ink

Also known as thermochromic security ink. An ink that can change its color when heated. This ink is easy to identify after printing. It can be used as one of the anti-counterfeiting functions of the general public product packaging.

1. Reversible thermochromism

The ink recovers from discoloration and cooling when the temperature rises. For example, a thermochromic ink fades back to its original color when the temperature rises to 28°C.

2. Irreversible thermal discoloration

Permanently discolored ink at a specific temperature. Suitable for flexo / gravure, water-based uv screen printing and uv flexo.

Special function ink

1. Scraping ink

A special white ink is darkened to gray/black when smeared with a coin, showing hidden information. Can be directly printed on paper, board can also be used in conjunction with masking paint, in the non-masked area to produce scratching discoloration effect. Suitable for solvent flexo / gravure, water-based flexo and traditional lithography.

2. Color change ink

The ink changed color as the viewing angle changed. This rainbow or pearl effect cannot be copied or scanned. This series of products has a large demand and performs best on screen printing on a black background. Suitable for solvent screen printing, solvent gravure and uv flexo.

3. Conditional color ink

A pair of bit-changing colors appear the same color under certain lighting conditions, and show a strong difference under the illumination of a specific light source (conditional color matching). Use a simple filter to see only one of the colors. This anti-counterfeiting method is used to generate invisible information suitable for most printing systems.

4. Reaction color change ink

Various chemical substances added to the ink can undergo various chemical reactions under certain conditions (heat-sensitive, pressure-sensitive, moisture-sensitive, etc., and acid-base indicators) to change the color of the ink. Already in some applications that require specialized security services, such as airline tickets. This type of ink has been developed into a finished product, but due to the fact that it is necessary to use certain conditions for identification, it has not been widely promoted.

5. Magnetic ink

Magnetic inks are suitable for black lithography, providing protection for advanced security documents and branded products. Dedicated detection tools are provided to confirm the authenticity of the detected item by the sound and green/red light. Suitable for solvent and water-based gravure, screen printing. Suitable for water-based gravure printing and water-based screen printing. Suitable for traditional black lithography.

6. Biochemical reaction ink

The ink is mixed with ingredients that support biochemical reactions. First use this ink to print a mark that is invisible to the naked eye in the package. Then select the chemical reagent according to the formula, and the text or pattern will appear when using the method such as micro heat, moistening, and rubbing. It is mainly used for the preservation of high-end archival preservation cultural relics.

7. LCD ink

Compounds with crystalline properties were added to the liquid crystal ink. The liquid crystal displays bright and dark patterns and colors due to changes in the crystal lattice under the influence of weak currents and temperatures. This is a new class of anti-counterfeiting printing technology at the current level. However, due to the observation that certain conditions are required, the application of the retraction pipe is larger.

8. Printing ink

The printing ink is made up of pigment, slope filling, connecting material, etc. Among them, the choice of color material is an important factor in determining the hue and vividness of printed products. Ink toning is a very complex problem. The chroma, brightness difference, and some intrinsic colors of some organic and inorganic pigments in the natural world cannot be achieved by artificial synthesis. In the same model produced by different ink factories, the colors are not the same in different batches. Therefore, some manufacturers of large-scale packaging and packaging products use their own products to print at some large-scale and more advanced printing companies. At the same time, they have customized special inks for printing of each product in the ink factory. The ink factory is responsible for confidentiality.

9. Change the ink

When a correction is made at the corresponding site, some kind of password will appear. This type of ink is mainly used to print securities such as cheques, money orders and documents.
The latest development trend of security ink

The anti-counterfeit ink technology has become a crystallization of the combination and comprehensive application of multidisciplinary scientific and technological achievements while integrating advanced technological achievements. According to the development trend of advanced anti-counterfeiting technologies at home and abroad and the market's anticipation of anti-counterfeit technology, the development direction of anti-counterfeiting inks in recent years and the technologies that have been highlighted for development mainly include the following aspects:

1. Anti-counterfeit inks should have the characteristics of being not easy to counterfeit, long-term validity of easy-to-recognize, and appropriate anti-counterfeit cost. It is the eternal direction of the development of anti-counterfeiting technology. It will become the common feature of future anti-counterfeiting technology products.

2. Anti-counterfeiting inks should be automatically identified with their anti-counterfeiting technologies (such as automatic identification technology) and will be more closely integrated with anti-counterfeiting printing technologies, showing an infinite vitality.

3. Security security ink and printing technology will go from the banknotes and other fields with extremely high integration of anti-counterfeiting to the civil high-end products.

4. Printing technology and papermaking anti-counterfeiting technology will continue to play an important role in the field of anti-counterfeiting and cannot be replaced.

5. Ink anti-counterfeiting and physical anti-counterfeiting technology, material chemical anti-counterfeiting technology and laser holographic anti-counterfeiting technology will be further closely combined to play an important role in defense The comprehensive use of anti-counterfeiting technology will become an inevitable trend of security products.

Source: China Ink Online