Acid etching is a technique used to create designs on surfaces, typically metals or glass, by applying a corrosive acid. The process involves covering the area to be etched with a protective coating, then exposing specific parts to the acid. The acid reacts with the exposed areas, creating a permanent design or texture. This method is commonly used in various industries, including jewelry making and art glass production. Acid etching allows for intricate patterns and details that are difficult to achieve with other techniques, making it a popular choice for artists and manufacturers alike.