This 1/2 ounce jar of Brown Acid Dye by Jacquard is a hot water concentrated powder dye used to colour silk, wool and other protein fibers (as well as some nylons). Extremely bright and colourfast, they exhaust extremely well and will not bleed or fade with washing. Jacquard acid dyes provide a uniform colour when immersion dyeing and may also be used for direct painting or printing applications using a steam setting. Acid dyes are known to produce the most vibrant colors of all dyes in the world.