Used primarily in chemiluminescent reactions, especially in glow sticks. When mixed with hydrogen peroxide and a fluorescent dye, it undergoes a chemical reaction that emits light without generating significant heat. This property makes it ideal for temporary light sources in emergency kits, toys, and novelty items. The reaction occurs in a sealed plastic tube where two separate solutions are mixed upon activation, producing visible light through energy transfer to the dye. Its stability in solid form and efficient light emission contribute to its widespread use in light-emitting applications requiring no electricity or flame.