Thermochromic ink is a special type of ink that changes color in response to temperature changes. It contains pigments that react to heat, allowing the ink to shift from one color to another when exposed to different temperatures. This property makes it useful for various applications, including packaging, toys, and temperature-sensitive labels. The ink can be used in both printing and coating processes, providing a visual indicator of temperature changes. For example, it can signal when a product is too hot to touch or indicate the freshness of food. Its unique characteristics make it a popular choice in creative and functional designs.