Used in the production of safety matches, where it serves as a key component in the match head, enabling ignition through friction. Commonly found in pyrotechnics and fireworks for its ability to generate bright flashes and smoke effects. Employed in some types of flame-retardant materials due to its thermal stability and resistance to combustion. Utilized in the manufacturing of certain semiconductors and infrared optical devices. Also applied in the formulation of pigments for specialty paints and coatings, providing a distinctive red or reddish-brown color. Historically used in some cosmetic products, though this application has declined due to toxicity concerns.