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Introduction to the Principle of Optically Variable Pigments

2023-04-16

Optically variable pigments are composed of optical thin film fragments with specific spectral characteristics. Optical thin films are designed based on the principle of light interference using multilayer films with specific reflection spectra. They are made up of different materials with different refractive indices, and are formed by depositing them in a specific order and thickness using high-vacuum coating technology on the same substrate. Optically variable ink made from optically variable pigments is the most complex interference-type anti-counterfeiting ink available today. The printed material has a brilliant metallic luster, and the color blocks display a pair of colors, such as red-green, green-blue, gold-silver, etc. When viewed directly or from the side under white light, they exhibit two different colors that change with the angle of observation. They have a strong color-changing effect, a significant feature, and a large color difference that cannot be replicated by high-definition scanners, color copiers, or other devices. These printing characteristics cannot be imitated by any other ink or printing method. They are suitable for screen printing, flexographic printing, letterpress printing, gravure printing, and other printing methods. Optically variable pigments are also suitable for surface spraying. The thickness of the layers of the optical thin film meets the interference conditions of light. After being illuminated by light, a series of light interference effects occur, and the color changes with the angle of observation. Optically variable pigments are made by crushing the optical thin film and other processes, and the color-changing effect of optically variable ink is achieved by adding optically variable pigments into ink. The color angle effect of this optical thin film is the key to the use of optically variable ink for anti-counterfeiting purposes.

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 in Decorative Building Materials

2023-04-15

HiBlueStar optically variable pigment has excellent high-temperature and weather resistance. When applied to outdoor building materials, outdoor decorations, and decorative items, it not only contributes to environmental protection and energy conservation but also creates a colorful and dynamic atmosphere.

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.

Optically variable pigments can be used to develop and produce automotive protective films with color-changing effects, collision resistance, and scratch resistance.

2023-04-15

Optically variable pigments can be used to develop and produce automotive protective films with color-changing effects, collision resistance, and scratch resistance.

Application of Optically Variable Pigments in the Automotive Industry

2023-04-15

The transparent series of optically variable pigments can also be used in the formulation of automotive paint. Depending on the original color of the vehicle's body, the automotive paint formulated with optically variable pigments can be directly sprayed to create a fashionable and dynamic effect. Alternatively, the paint can be applied after being treated with a black basecoat to produce a cool and colorful finish that highlights one's personality. Transparent light change effect Black background light change effect

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