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Introduction to Optically Variable Ink for Anti-Counterfeiting

2023-04-18

Optically variable ink is a special ink that contains a specially developed substance in its composition to achieve anti-counterfeiting effects. This ink is widely used in the printing of anti-counterfeiting products. Its application in the field of anti-counterfeiting is extensive, and its manufacturing process and production formula are strictly controlled and confidential. The produced optically variable ink cannot be sold or supplied casually and must be provided to qualified manufacturers for use according to regulations. The reason why optically variable ink can be used in the field of anti-counterfeiting is that this ink is a special printing ink composed of pigments, binders, and ink additives, which are processed through a special process by adding anti-counterfeiting materials with special properties to the ink binders. Nowadays, optically variable ink is widely used in various fields for anti-counterfeiting purposes. It is used in the anti-counterfeiting printing of various tickets, documents, trademarks, and logos. The application of optically variable ink in the field of anti-counterfeiting has become mature worldwide, and there have been various developments in printing methods and carrier media for printing. Different types of optically variable ink are available for different carrier media, such as ordinary paper, newsprint, and plastic. Different inks are used for different printing forms such as relief printing, intaglio printing, lithographic printing, and water-based flexographic printing. The advantages of using optically variable ink in the field of anti-counterfeiting include mature technology, low cost, good concealment, and high resolution.

Optically variable pigment - Optical interference color-shifting pigment

2023-04-18

Regarding optically variable pigments, we often come across them in our daily lives. Optically variable pigments are widely used in packaging of various products, decoration of items, and color matching in the cosmetics industry. Different types of optically variable pigments are used in different applications. Here, we introduce a new type of advanced optically variable pigment - the optical interference color-shifting pigment. What distinguishes this pigment from ordinary pearl pigments is that its composition does not include a substrate, but is composed of multiple layers of nano-scale thin films. The colorful effect is achieved by the interference changes between the layers of thin films. Additionally, as multiple layers of thin films are stacked, a three-dimensional color change effect and a shiny metallic luster effect can be presented. The technical principle of this new type of optically variable pigment is similar to that of other optically variable products, both based on the principle of optical interference and presenting different colors depending on the angle of the incident light. However, it uses materials composed of multiple refractive indices. In order to achieve optical color-shifting, the principles of physical meteorology sedimentation need to be referred to accurately control the size and sequence of each layer of thin films, allowing them to settle regularly on the same carrier. When the incident angle of light is different, the equivalent optical path length through the layers of the optically variable pigment will be different, resulting in spectral shifts and reflecting or refracting different colors.

Manufacturing of Photochromic Ink (Chameleon Ink Production Process)

2023-04-18

Photochromic ink, also known as optical variable ink or chameleon ink, can present completely different colors under different viewing angles of human eyes in white light. It usually appears as a pair of colors, such as red-green, green-blue, gold-silver, etc. Its color-changing effect is strong, with large color difference and obvious features. Due to its color angle effect, it cannot be replicated by any high-definition scanner, color copier or other devices without any instruments, and its anti-counterfeiting reliability is extremely strong. The printing feature of photochromic ink cannot be imitated by any other ink and printing method. The manufacturing process of photochromic ink generally involves dissolving photochromic colorants in solvents to produce micro-encapsulated pigments, and adding binders to the dissolved colorants for different purposes. Photochromic colorants can also be dissolved into monomers, and these polymer micro-particles can be pulverized and made into powders as pigments. Ink made with this method has ten times the light resistance compared to microcapsule ink. These powders can be added as pigments to water-based ink, oil-based ink, plastic ink and all adhesives. Photochromic ink is widely used in the anti-counterfeiting of currencies and securities in many countries due to its reliable anti-counterfeiting features.

A new method for manufacturing optically variable pigment

2023-04-18

Optically variable pigments are a special type of pigment that possess unique optical properties compared to ordinary pigments. Here, a new method for manufacturing optically variable pigments is introduced. The optically variable pigments produced using this method have particles that are shaped like geometric shapes, numbers, letters, and other special shapes, which is a significant improvement in the level of anti-counterfeiting technology while still maintaining the basic optical properties of optically variable pigments. Currently, the shaping of pigment particles is usually done using methods such as laser ablation, pressure crushing, specific templates, or substrate separation. For example, lasers can be used to engrave hollow patterns on large pieces of pigment. However, these methods are complicated and costly, and cannot be applied to mass production. Moreover, the shape of optically variable pigment particles is subject to many limitations, and the degree of customization is low. The new manufacturing method described here involves directly molding a shaping layer onto a substrate. This shaping layer is divided into three regions: a flat region, a first surface micro-embossed structure, and a second surface micro-embossed structure. Since the coating of the micro-embossed structure is thin and easy to damage, different coatings can be dissolved to obtain coatings of different thicknesses, thereby forming optically variable pigment particles with different optical effects.

Optically variable magnetic ink and film have been used in the printing of currency in India and Myanmar.

2023-04-15

Optically variable ink and film have been used to print currencies in over 100 sovereign countries such as China, the United States, and Russia. The magnetic optically variable effect of Myanmar currency. As of now, only three companies in the world have developed and produced optically variable materials that meet the requirements for currency use. Among them, our optically variable materials have been used in the printing of currencies in India and Myanmar.

The application of optically variable pigment ink on currency and security documents.

2023-04-15

Optically variable pigment-based intaglio and screen printing ink has been widely used in currencies, securities, cards, anti-counterfeit documents, and high-end packaging. Among them, "Furongwang" + "Hetianxia" brand cigarettes produced by Hunan China Tobacco, "Huanghelou" brand cigarettes produced by Hubei China Tobacco, "Wuyeshen" brand cigarettes produced by Guangdong China Tobacco, and "Jixiang" brand cigarettes produced by Lanzhou China Tobacco have all adopted optically variable ink for printing. As of now, there are still more than 30 provinces (municipalities, autonomous regions) in China where cigarette packs produced by China Tobacco have not been printed with optically variable ink.

Technical Features of Optically Variable Ink

2023-04-15

Optically variable ink has the following technical features: 1，Color changing effect: With the change of the viewing angle, the color changes. For example, when viewed head-on, it appears purple, and when viewed at an angle, it appears yellow-green; when viewed head-on, it appears blue, and when viewed at an angle, it appears green. 2，Lightfastness: Level 8. 3，Heat resistance: 160℃. 4，Water resistance: Level 5. 5，Acid resistance: Level 5. 6，Alkali resistance: Level 5.

Application of Optically Variable Pigments on High-end Consumer Goods

2023-04-15

Optically variable pigments, also known as color-shifting pigments, can be used to develop high-end household appliances, crafts, and personal items with color-changing effects that highlight one's personality.

Use of Optically Variable Pigments in the Coating Field

2023-04-15

Dozens of optically variable pigments in three major series - high-gloss, transparent, and semi-transparent - can be used for spray coating on cosmetic bottles, creating a high-end and fashionable look.

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