Color-shifting ink is a special type of ink that changes color when viewed from different angles. This unique property is often used in security features for items like banknotes and identification cards, making them harder to counterfeit. The ink contains microscopic structures that reflect light in various ways, creating the color-changing effect. This technology is also popular in printing and packaging, adding visual interest to products. Color-shifting ink can enhance branding and attract consumer attention, making it a valuable tool in marketing. Its ability to provide both aesthetic appeal and security makes it a versatile choice in various applications.