I've been using Cushing's perfection dyes for years now to dye bucktails,squirrel tails,marabou,kiptails and assorted duck feathers.Very happy with all their dyes except black.I tried to dye some white kiptials and they turned out gray.I may have to dye them twice to get black.Great color selection as well.One package will dye a pound of materials,dry weight.For smaller amounts I use less dye.