Broken Glass Cupcakes   Ingredients 1 Can white frosting 1 Box Red Velvet Cake Mix   Sugar Glass: 2 cups water 1 cup light corn syrup 3 1/2 cups white sugar 1/4 teaspoon cream of tartar   Edible Blood: 1/2 cup light corn syrup 1 tablespoon cornstarch 1/4 cup water, or more as needed 15 drops red food coloring 3 drops blue food coloring