green, red, and blue food coloring
Mix the lemonade and soda; add 6 drops green food coloring, stir, and set aside.
Pour the corn syrup into a bowl; stir in two drops each of red and blue food coloring.
Dip the rims of 6 glasses into the syrup mixture. Turn the glasses upright and watch the ooze drip down the sides.
Fill each glass with punch; garnish with gummy worms.