Thermochromic inks are special types of inks that change color in response to temperature changes. These inks contain temperature-sensitive compounds that react to heat, allowing them to shift from one color to another. They are commonly used in products like temperature-sensitive labels, packaging, and novelty items. These inks can be found in various applications, including thermometers and children's toys, where visual feedback is important. When the temperature rises or falls, the ink's molecular structure alters, leading to a visible color change. This unique property makes thermochromic inks useful for both functional and decorative purposes.