Step 3: Color the Shortening
If you are using icing colors (which I recommend for the many colors possible), you will want to use toothpicks. Just poke the toothpicks in the color and swirl the toothpick around the shortening to colorize it. If you are using food color, put a few drops in the shortening and swirl with a toothpick.
You can mix colors to get the exact color you want. Keep in mind that the food color will really show up on your lips alot if you put enough!