Jacquard Acid Dyes, 8 oz Powder Fabric DyeJacquard acid fabric dyes are used to color protein fibers and nylons, and nothing does it better! Jacquard Acid Dyes are concentrated powdered hot water fabric dyes that produce the most vibrant possible results on protein fibers including silk, wool, cashmere, alpaca, feathers, and nylon. This is the dye we use when we make our own hand dyed yarns in store. The only acid involved is the vinegar or citric acid you add to the dye bath Extremely