Acid wash is a textile finishing process used primarily on denim fabrics to create a faded, worn appearance. This technique involves treating the fabric with a mixture of water and a mild acid, such as hydrochloric acid, which removes some of the dye and alters the fabric's texture. The result is a unique, distressed look that is popular in fashion. The acid wash process can also enhance the softness of the fabric, making it more comfortable to wear. It is commonly used in the production of jeans, jackets, and other denim products, contributing to the casual style that many consumers prefer.