自古以來人們就開始使用天然染料。這些是自然的，無公害的，綠色的染料
Mix 8 grams of alum with 7 grams of cream of tartar in a small amount of hot water. Add the solution to a metal pan of cool water. Next, add the wool and place the mixture over heat. Slowly bring the liquid to 82 degrees Celsius. Heat the mixture for 45 minutes. After it cools, remove the w…