Widely used as a color-forming agent in thermal paper coatings, this compound reacts with developers like bisphenol A to produce visible images upon heating. It is essential in point-of-sale receipts, fax papers, and labels due to its clear color development and stability at room temperature. The dye remains colorless until heat is applied, making it ideal for clean, instant imaging without ink. Its performance in low-humidity environments and compatibility with various coating formulations enhance its industrial appeal.