👉 Correlation fluid, also known as thermochromic or light-sensitive fluid, is a special type of smart material that changes its physical properties in response to temperature or light variations. This fluid contains microcapsules filled with a liquid dye that alters its color based on the surrounding temperature, making it useful for applications like temperature-sensitive labels, smart textiles, and dynamic displays. When the fluid is exposed to a specific temperature range, it expands or contracts, causing the dye to shift its color, thus providing a visual indicator of temperature changes. This unique property makes correlation fluid an innovative solution in fields ranging from consumer electronics to medical diagnostics.