Harry Potter Spells and Potions Creative Science Kit 701 "Unpredictable Potions" Hands-on science activity kit for Harry Potter fans ages 8 and up. Self-contained kit contains materials and instructions (laboratory notes) for three experiments. Make a Polyjuice Potion, create a Swelling Solution, and brew some Skele-Gro Potion. Kit produced by Delta Kids with the release of Harry Potter and the Chamber of Secrets. No longer made. Very limited quantities available.