Arsenic(II) sulfide is primarily used in the production of specialty glasses and semiconductors due to its unique optical and electronic properties. It is employed in the manufacturing of infrared-transmitting glass, which is essential for thermal imaging systems, night vision devices, and optical fibers for infrared spectroscopy. The compound also finds use in certain types of photovoltaic cells and photoresistors because of its sensitivity to light. Additionally, it has been utilized in some pigments for ceramics and glass art, providing rich red, orange, or yellow hues. Due to its toxicity, handling requires strict safety controls, limiting its use to specialized industrial and research applications.