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Optically variable ink is a highly useful special ink that changes color when viewed at different angles. This property makes it especially useful in the creation of security documents, as it can be difficult to replicate. Different types of inks fulfill different requirements and can be used in various applications.
Single color ink
This type of ink consists of a single color that changes when viewed from different angles. This is most commonly used in banknotes, passports and other security documents. More than being decorative, the function of this ink is to provide basic security. When you add one more layer of complexity to counterfeiting, such as the need to replicate this color-changing property, you increase the efficiency and safety of the document.
Multicolor ink
As the name implies, this kind of ink displays more than one color when viewed from different angles. Such inks can be more effective for security purposes since they are visually striking and more complex than a simple single color shifting ink. Applications can be in high-end packaging materials, anti-counterfeit labels, and security cards.
Gleaming inks
Lustrous inks comprise pigments that reflect light in optical-variable ink. This effect can enhance the color-shifting effect of the ink and make it more eye-catching. You may also find materials with iridescent ink in the branding of luxury goods, as the faint shine adds to the perception of elegance and value.
Thermochromic inks
Combine with color-shifting inks that change colors with temperature changes. This kind of ink can be useful in security applications where heat exposure can be either expected or where it is desired that the ink change color to indicate fraudulent activities. Packaging for pharmaceuticals and perishable foods may have color-changing inks that indicate heat exposure or other environmental sensitivities.
Glow-in-the-dark inks
These kinds of inks store energy when illuminated and then release it by glowing in low light or darkness. You will commonly find this ink used in combination with optic-variable ink for additional layers of complexity and security. Glow-in-the-dark inks are frequently utilized in high-security government IDs, credit cards, and labels for restricted areas in the industrial and consumer markets.
The following are some key considerations for buyers when choosing variable optical inks for their business.
Quality and performance
Buyers should ask suppliers for product data showing how the ink operates. Quality and performance depend on durability, effectiveness in color shifting, sharpness, and resolution in printing.
Document security level
Buyers need to understand the security levels they plan to protect with OVI. For instance, high-security applications such as currency and identification documents will need more advanced OVI with multicolor or holographic effects, while lower security such as labels may only need simpler formulations.
Application and compatibility
The ink needs to be compatible with the surfaces where it will be printed. OVI inks come in different types suitable for printing on paper, plastic surfaces, or metal. Buyers need to choose OVI ink of the correct type for the surface they plan to use.
Cost and supplier reliability
While price is important, Buyers also need to consider the overall value that a variable optical ink brings to its applications. Advanced security features may be necessary for some applications, while simpler uses may not need more than basic features. Similarly, suppliers' reliability informs buyers about the consistency of ink performance and supply. Buyers should also take into account the OVI inks they have researched and the feedback they receive concerning their performance and quality.
Sustainability and regulations
Buyers should consider opting for OVI inks made of environmentally safe materials. This is especially the case if they operate in a jurisdiction with stringent environmental standards. Also, Buyers should confirm that the ink complies with all industry standards and regulations.
Optical variable ink materials are comprised of several specially formulated inks and pigments. The following are the main materials that make up optical variable ink.
Polymer resins
Resins form the basis of OVI inks as they are responsible for binding the various ink components together. This provides for good adhesion of the ink on the printed surface. The polymer resins used come in different types, including acrylics and polyurethane, depending on the required properties and formulations.
Liquid crystalline polymers (LCPs)
LCPs are added to the OVI formulations as they are critical for the color-shifting capability of the ink. These polymers have the unique property of being able to change shape when exposed to varying temperatures. They will thus alter the arrangement of colorimetric dyes in response to changes in viewing angles. Different LCPs are employed to manufacture inks that shift colors differently.
Metallic pigments and flakes
OVIs also contain metallic pigments and flakes, which are usually added to enhance their iridescent properties. These metallic materials interact with light in complex ways that produce the inks' shimmering and sparkly appearance. Materials used include aluminum, copper, and mica-based pigments. Luminescent or fluorescent pigments may also be added for more effect.
Colorimetric dyes
Dyes play one of the most crucial roles in determining the colors that will be available in variable optical ink. These are generally highly pure materials that provide the most intense colors as they interact with light in a unique way. The dyes used in OVI formulations consist of dyes incorporated in liquid crystal displays and engineered to provide stability and consistency when exposed to varying temperatures, just like in LCDs.
Solvents and additives
In addition to the above materials, OVI formulations also contain various solvents and additives. Solvents are used to dissolve the resins and give the ink proper viscosity for easy printing. Additives improve the airflow of the ink, prevent its foaming, and add other benefits like increasing its shelf life.
These inks are mostly used in commercial applications by businesses that offer printing services. Some businesses may also engage in DIY OVI printing as a hobby.
Usage for printing businesses
Businesses usually deploy OVI with other regular inks using standard printing technology such as offset, flexo, gravure, or screen. Important operational details like ink formulation, surface treatment, and printing conditions should be monitored to get the best results. Marketing OVI printed items like banknotes, security labels, packaging, and product authentication can be rewarding enterprises as they are in high demand to increase security and prevent counterfeiting.
DIY optics variable printing
OVIs can actually be used in DIY projects. It is only necessary to procure the optical variable materials such as resins, special pigments, and colorimetric dyes. When mixing the ink, one should ensure a homogeneous mixture by blending the pigments and resins properly. After preparing the ink, use a normal printing process such as screen or flexography to lay it on the surface to be printed. DIY materials can be a learning experience because home enthusiasts can learn how to use OVI effectively and create small samples or products for trials. The only potential downside to DIY OVI is that the materials are less accessible, making the processes less predictable than professional quantities and methods.
Optically variable inks are a sophisticated security measure used to create multiple effects when viewed from differing angles. Here are some of their advantages:
Anti-counterfeiting
Increased security against counterfeiting is the most important advantage of using OVI. Changing perspective, OVI is very difficult for criminals to replicate, significantly reducing the risk of fraud. Enhanced security enables greater consumer confidence in documents like banknotes, identity cards, and certification papers.
Increased design attractiveness
OVIs are attractive because they appeal to the general user and draw attention with their remarkable color-shifting and optical effects. OVI therefore makes more attractive high-value products and packaging, enhancing their market appeal. Manufacturers of luxury goods thus prefer OVI to enhance brand recognition and create a unique selling point.
Customization options
OVIs also come with a variety of colors, finishes, and effects depending on the needs of the users. This means that each application can be tailored so that brands can attain individuality or fulfill specific security needs. Such customization is also highly useful when they help create a special brand identity and strengthen a brand's market positioning.
Durability
OVI printed matter possesses excellent durability and usually resists fading, scratching, and weather phenomena. This means that security features will retain their effectiveness over time and under varying circumstances. Enhanced durability ensures that brand integrity is protected, and that practical applications like authentication and validation are achieved continuously.
User engagement and interaction
OVIs impress users and invite interaction, as most people will find it intriguing to watch the inks change colors as they tilt the object. This feature creates a more memorable experience with products and enhances their value, especially for collectibles or high-end merchandises. User engagement with their products makes for a deeper connection with the brand and increased satisfaction and loyalty.
A1. All industries with a tangible product benefit from OVI to a large extent. However, industries that deal with high-value items and specialized goods find it even more essential.
A2. The most common uses are in currency, where banknotes use them as anti-counterfeiting measures, and ID cards for personal identification. They are also used in tax stamps and legal stamps to secure them from tampering. Worth mentioning too are high-end consumer products like cosmetics, electronics, and alcoholic drinks where manufacturers use them to increase security without losing aesthetics.
A3. Yes, OVIs are intended to be extremely durable, and most of them tint UV protection inks that enable them to resist fading and wear owing to climatic elements. This makes them suitable for outdoor applications like security badges and architectural design where items are subject to direct sunlight and weather in general.
A4.Yes. There’s an environmentally safe OVI that fulfills the same functions and uses eco-friendly materials.
