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I highly recommend not only preparing your potion bottles in advance, but also practicing each experiment in advance. They definitely add a lot of ambiance to the entire idea of being in a potions class with lots of fun references to the wizarding world.
Keep scrolling to see a video to show how simple these experiments are to do. Harry Potter Potions Class: Dancing Water Drops
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Of course when vinegar and baking soda meet you get a lot of bubbles which totally looked like magic was happening in this “empty” cup. And, just for fun, the potions are in code using words like Crushed Phoenix Feathers (in lieu of baking soda) and Basilisk Venom (instead of warm water), but don’t worry, I include a decoded ingredient chart as well.
If kids handle the cups a lot you know they are going to be swinging it around and it will mess up the surprise. The image above with blue sand (because our code for “sand” in this potion is “baby dragon scales” so this blue looked super cool!) was the potion the day of the party. We regret that due to hygiene regulations, unwanted earrings, drinks and confectionery cannot be returned.
Since I had the entire potions class set up in my kitchen, I simply did this experiment on the stove top the day of the party.