As2S3, also known as arsenic trisulfide, is a chemical compound composed of arsenic and sulfur. It appears as a yellow or orange solid and is commonly found in nature as the mineral orpiment. This compound is used in various applications, including the production of pigments, glass, and in some semiconductor technologies. In addition to its industrial uses, As2S3 has significance in the field of chemistry and materials science. It can be synthesized through the reaction of arsenic and sulfur at high temperatures. However, arsenic is toxic, so handling As2S3 requires caution to avoid health risks associated with arsenic exposure.