With the understanding of counterfeit products, people are increasingly aware of the important position of ink and paper in anti-counterfeiting printing. The roles of the two are discussed below:
1. Ink
Many security inks can mark "the original has been changed" or prove that an original is true. The following are some introductions to security inks:
1. Chemical solvent reaction ink
These inks will disappear, fade, and become dirty when they come into contact with wipes, bleach, water, or other solvents.
The ink that reacts with the solvent is usually printed on the background area or a certain area of ​​the document. For example, when printing the data area of ​​a check with this ink, the change of the check can be easily detected. According to different ink types, the ink will disappear, fade, and become dirty when changed. These inks can be used to prevent damage to many documents. One of its main applications is discount checks.
Chemically sensitive inks are evaluated by the ANSI X9B10 committee. Their ability to prevent changes is strong. 3/10 of this ability is to prevent erasure, and 7/10 is to prevent reaction with bleach and other solvents.
2. Erasable ink
Erasable inks provide a clear and visible indication and are often used to print background colors. If someone wants to change the check, the ink will be erased. A bright or light solid background is the most effective, because the erasure will be obvious and the background is not easily copied by the color copier. Erasable inks come in a variety of colors, including fluorescent. One of its applications is hotel guest checks. The check includes the background of the quantity area printed with erasable ink. If the customer tries to change the total number by erasing, the colored background will disappear.
3. Fluorescent ink
This ink, which is sometimes invisible to the naked eye, will glow under ultraviolet or infrared light. Due to its switchable and hidden features, the heart cannot be accurately reproduced on a color copier, making the ink more and more in some applications The more popular. Some parts of the check, such as the MICR line, can be made into a fluorescent color; or a certain piece of the check is characterized by a fluorescent color, for example, a watermark is sometimes printed with a fluorescent ink. Many currencies in the world are printed with fluorescent ink, which has a wide range of colors.
4. Infrared ink
This ink absorbs or reflects infrared light. When a box of black infrared ink is printed on a message, the ink is used to cover the "true" or "original" information. This information can only be read under the infrared lamp. The information itself can also be printed with infrared ink and can only be displayed under an infrared light. Just as with fluorescent inks, the person verifying the document must have knowledge of the ink's appearance and appropriate equipment.
5. Penetrating ink
Infiltrating ink is often used to print MICR data on a check. The ink will penetrate the bottom layer and display the printed content on the back of the document. By comparing the front and back, you can detect changes in numbers and other illegal information. In some special cases, invisible fluorescent ink can be added as a cover feature to provide special security.
The penetrating ink can be used on cash record slips to prevent customers from changing information in order to obtain more money from rebates, and the ink can also prevent copying of record slips.
6. Thermal chromium ink
This ink is also called thermal ink. When a person touches a document, the ink will change color due to the influence of the body temperature of the human body. When the ink is no longer touched, it will change back to the original color. The ink is now being used to sign medical prescriptions to reduce medical scammers. Generally, thermal chromium ink is printed on the side of the table under the patient's name, age, address, and date. When the ink is touched, it will automatically disappear.
There are many kinds of color transformation, including from blue to colorless, orange to yellow to red to colorless. Double thermal chromium ink will make it discolored when rubbed, and the increased friction will make it continue to change to a different color. Colorless to colored thermal chromium ink is mainly used for direct mailing, advertising, promotion materials, packaging, labels, education and learning aids, stationery and other novelty; color to colorless thermal chromium ink is mainly used For security documents, because even a color blind can distinguish between colored and colorless transitions to verify the document.
Many suppliers offer friction-changing inks, which change color because of friction rather than body temperature. Just like its own carbon-free coating, the ink is encapsulated and coated and requires inspectors to scrape it with nails or objects to discover the information. Unlike thermal chromium ink, this ink will not change back to its original color. It also changes chemically, and the ink will automatically turn blue or partially turn blue when in contact with chemicals. This ink is used for documents, important checks, and can be printed publicly or in secret. [next]
2. Paper
Security paper is a rapidly growing part of the paper industry, and it can effectively prevent documents from being tampered with. There are many companies in the United States that are beginning to provide safe paper. Many of the technologies discussed below (not completely) are provided by several paper manufacturers.
Chemical reaction paper
This paper reacts with the following solvents: bleach, nail rust remover, gasoline, kerosene, paint thinner and turpentine. When reacting with solvents, the paper will change to another color or display a useless message with multiple symbols.
2. Safety fiber and marking material
Paper manufacturers provide a variety of raw materials for the manufacture of safety paper, such as hidden or open fibers, marking materials, etc. Hidden materials, such as fluorescent fibers or marking materials, can be inspected with ultraviolet light. Like fluorescent security inks, fluorescent fibers and marking materials cannot be copied or scanned.
3. Toner curing paper
This type of paper is considered to be easier to "adsorb" laser printing toner than ordinary paper. This feature makes it difficult for criminals to modify checks or other information. This is designed for end users who use lasers to print checks.
4. Ultraviolet dull / dead paper (dull: partially transparent or reflected light; dead: opaque or non-reflective light)
Ultraviolet dull paper extracts most of the fluorescent color from the paper, while ultraviolet dead paper has no fluorescent color at all. Watermarks printed on fluorescent dull / dead paper with fluorescent ink will be brighter under ultraviolet light, because the paper will not affect the watermark.
5. Watermark
There are many types of watermarks for security documents, such as mesh watermarks. When the paper is wet, an image is imprinted into the paper. When facing the light, this watermark can be seen from both sides of the document.
Artificial watermarks can also appear on both sides. Sometimes it looks like a real watermark, but it is cheaper than a real watermark because it does not include the cost of molding. Both watermarks are difficult to copy. Watermarks can be printed with fluorescent inks, so they glow under ultraviolet light.
3. Future Security Printing
The key to the successful use of security features lies in the level of knowledge and correct use of document inspectors. For some suppliers, how to teach end users and document inspectors to detect security features based on ink and paper is a big problem. Some suppliers rely on manufacturers to teach customers, or ask manufacturers to hold workshops for their customers.
But whether it is machine inspection or manual inspection, the safety features of neutralizing ink and paper are usually better than relying on ink or paper alone. The more security features a document includes, the less likely it is to be forged.
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