Acid dyes are used to color silk wool feathers other protein fibers and nylons and nothing does it better Extremely brilliant and colorfast Jacquard Acid Dyes are highly concentrated powdered hot water dyes that produce level uniform color during immersion dyeing. They exhaust well and wont bleed or fade with washing. Acid dyes are known to produce the most luscious colors of all and Jacquards palette is unsurpassed for quality intensity and consistency. Dyes May be used for direct painting or printing applications in addition to yarn fiber and fabric dyeing. Dont be alarmed by the name the only acid involved is the white vinegar or citric acid that you add to the dye bath. Colors vary in price due to the high quality natural pigments used in each dye. This package contains 8 ounces of dye. Made in the USA.