Butternut is a historical lightfast and colorfast natural dye. It was used to color the wool uniforms of Confederate soldiers during the American Civil War. (Gray was achieved by adding iron to the dye bath.) Because of this, Confederate soldiers were sometimes called "butternuts". You are purchasing three ounces of bark. When used with the mordant alum, butternut yields a pleasant, warm brown as pictured on the yarn. Quantity is enough to dye one pound of fiber.