The importance of ink and paper in printing
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With the understanding of counterfeit products, people are increasingly aware of the important position of ink and paper in anti-counterfeiting printing. The following discusses the role of the two:
One, Ink:
Many safety inks can indicate that the original has been altered or that an original is true. Here are some examples of safe inks:
1. Chemical solvent reaction ink
These inks will disappear, fade, and become dirty when in contact with an eraser, bleach, water, or other solvent.
The ink that reacts with the solvent is usually printed in the background area or a certain area of the document. For example, when the data area of the check is printed with this ink, the change of the check is easily detected. Depending on the ink type, the ink will disappear, fade, and become dirty when it is changed. These inks can be used in many documents to prevent damage, and one of its main applications is discount checks.
Chemically sensitive inks by ANSI
The X9B10 committee to assess. They are very capable of preventing changes. 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 of the background color commonly used. If someone wants to change the check, the ink will be erased. A bright or light-colored solid background is most effective because the erasing is noticeable and the background is not easily reproduced by the color copier. Erasable inks come in a variety of colors, including fluorescence. One application of it is a hotel guest check, which includes the background of the quantity area printed with erasable ink, and 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, emits light under ultraviolet or infrared light. Due to its convertible and hidden characteristics, the heart cannot be accurately reproduced on a color copier, making the ink come in some applications. The more popular. Some parts of the check, such as the MICR line, can be made to be fluorescent; or a whole piece of the check is characterized by a fluorescent color, such as a watermark sometimes printed with a fluorescent ink. Many currencies in the world are printed using fluorescent inks, which have 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 piece of information, the ink is used to cover the "true" or "original" information. This information can only be read under the infrared light. The information itself can also be printed with infrared ink and can only be displayed under infrared light. Just like using fluorescent inks, the person who verifies the document must have knowledge of the ink and appropriate equipment.
5. Penetration ink
Infiltrated inks are often used to print MICR data on a check, which penetrates the underlying layer and displays the printed content on the back of the document. Digital changes and other illegal information can be detected by comparing the front and back sides. In some special cases, invisible fluorescent ink can be attached as a cover feature to provide special security.
The osmotic ink can be used on a cash order to prevent the customer from changing the information in order to get more money from the rebate, and the ink can also prevent the copy of the record.
6. Thermal chrome ink
This ink is also called a thermal ink. When a person touches a document, the ink changes color due to the body temperature of the human body, and changes back to the original color when it is no longer touched. The ink is now being used on medical prescriptions to reduce medical scammers. Generally, the thermal chrome ink is printed on one side of the patient's name, age, address, and date. The ink will disappear automatically when it is touched.
There are many variations in color, from blue to colorless, orange to yellow to red to colorless. A double thermal chrome ink that will discolor when rubbed, and the friction will continue to change to a different color. Colorless to colored transition thermal chrome inks are mainly used for direct mailing, advertising, advanced materials, packaging, labeling, education and learning aids, stationery and other novelty; thermal chrome inks with color to colorless conversion are mainly used In the security document, because even a color blind can distinguish between a colorless and a colorless transition to verify the file.
Many suppliers offer friction-discoloring inks that discolor because of friction rather than body temperature. Just like its own carbon-free coating, the ink is packaged and coated and requires the inspector to scratch it with nails or objects to find information. Unlike thermal chrome inks, this ink does not change back to its original color. It also undergoes chemical changes that automatically turn blue or partially blue when in contact with chemicals. This ink is used on documents, important checks, and can be printed publicly or invisibly.
Two, Paper
Secure paper is a rapidly growing part of the paper industry and is effective in preventing files from being stolen. There are many companies in the United States that are beginning to offer secure paper, and many of the techniques discussed below (not exactly) are provided by several paper manufacturers.
1. Chemical reaction paper
This paper reacts with the following solvents: bleach, nail rust remover, gasoline, kerosene, paint thinner and turpentine. When the ink reacts with the solvent, the paper changes to another color or displays a multi-symbol useless message.
2. Safety fibers and marking materials
Paper manufacturers offer a variety of raw materials for the manufacture of safety paper, such as hidden or open fibers, marking materials, and the like. Hidden materials such as fluorescent fibers or marking materials can be detected by ultraviolet light. Like fluorescent safety inks, fluorescent fibers and marking materials cannot be copied or scanned.
3. Toner curing paper
This type of paper is considered to be more "adsorbing" to the laser print toner than plain paper, a feature that makes it difficult for criminals to change checks or other information. This is designed for end users who use laser to print checks.
4. UV dull/dead paper (dull: partially transparent or reflected light; dead: opaque or non-reflective)
UV dull paper extracts most of the fluorescent color from the paper, and there is no fluorescent color in the ultraviolet dead paper. Watermarks printed with fluorescent ink on UV dull/dead paper will be brighter under UV light because the paper will not affect the watermark.
5. Watermark
There are many types of watermarks for security files, such as mesh watermarks. An image is imprinted into the paper when the paper is wet, and the watermark can be seen from both sides of the document when facing the light.
Artificial watermarks can also appear on both sides, sometimes looking like a real watermark, but 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 emit light under ultraviolet light.
Three， Future security printing
The key to the successful use of security features is the level of knowledge and proper use of document inspectors. For some vendors, how to teach end users and document inspectors to detect ink and paper based security features is a big challenge. Some suppliers rely on manufacturers to teach customers, or ask manufacturers to hold workshops for their customers.
However, whether it is machine inspection or manual inspection, the safety features of neutralizing ink and paper are generally better than relying solely on ink or paper. The more security features a document includes, the less likely it is to be forged.