Thermochromic ink is a special type of ink that changes color in response to temperature changes. This unique property allows it to be used in various applications, such as in temperature-sensitive labels, packaging, and even clothing. When the temperature rises or falls, the ink reacts by altering its color, providing visual feedback. The ink works through the use of specific dyes that are sensitive to heat. These dyes can be mixed with other materials to create a wide range of colors and effects. Thermochromic ink is often used for fun and practical purposes, making it popular in both commercial and artistic projects.