Purple dumpling skin is very easy to make ah! It is the flour into the purple potatoes together with the kneading, so that the kneading of the surface is purple, to darker colors, put some more purple potatoes, to light color, put less perilla, so that the color of the dumplings is very nice, green, you can take the leaves of the water and the surface of the dumplings made of green, you can try a lot of colors.