Planet Bath Bombs

We mixed the citric acid and baking soda right on the kitchen counter, and the little fizz test before molding actually got my daughter excited about the chemistry part. The cornstarch made the base easy to pack into the molds without sticking, and our first batch turned out solid enough to gift.

My kid pressed the molds for a full hour without losing interest, and the fizzing reaction when we dropped one in the tub was way more dramatic than store-bought ones. The cornstarch made the mixture easy to pack, so even our first batch held its shape perfectly.

The citric acid and baking soda mix fizzed exactly as promised, and pressing the molds together was surprisingly satisfying for both me and my kid. It’s messy in the best way, but the learning curve is real—our first batch crumbled, so give it a few tries before expecting perfect spheres.