Widely used as a color-forming agent in thermal paper coatings, this compound enables image development upon heating without the need for ink. It is especially valued in point-of-sale receipts, labels, and fax paper due to its sharp color contrast and stability at room temperature. The chemical remains colorless until exposed to heat, where it reacts with a developer (such as bisphenol A or a phenolic resin) to produce a visible image. Its formulation allows for tunable sensitivity and image intensity, making it suitable for high-speed printing systems. Additionally, it contributes to long-term print stability under normal storage conditions, although prolonged exposure to light, heat, or oils may cause fading or discoloration.