Acid dyeing is a method used to color protein fibers such as wool, silk, and nylon. This technique involves using acid dyes, which are water-soluble and require an acidic environment to bond effectively with the fibers. The process typically takes place in a dye bath, where the fabric is immersed in a solution containing the dye and an acid, such as vinegar or citric acid. The dyeing process allows for vibrant and long-lasting colors, making it popular in textile arts. Acid dyes can produce a wide range of shades and are often used in hand-dyeing and commercial dyeing applications. Proper temperature control and timing are essential for achieving the desired results.