Planet Bath Bombs | KiwiCo

The citric acid and baking soda mix fizzed exactly as promised, and my daughter loved watching the colors swirl once we dropped one in the tub. We pressed ours into the molds and they held their shape perfectly overnight — messy kitchen, but totally worth it.

My kids were thrilled to press their own bath bomb molds and watch the citric acid fizz take over the tub—the kitchen smelled like a science fair for an hour. It's messy in a fun way, and the learning payoff is totally worth the cleanup.

We pressed the molds together as a family activity, and the cornstarch in the mix made the texture way less crumbly than I expected. My kid loved watching the citric acid fizz take over the tub, and the bombs held their shape perfectly.