Shimmer n Sparkle Rainbow Popping Bath Bombs -DIY Bath Bomb Making Kit. Popping Fizzy Bath Bomb Fun - make your own popping fizzy bath bombs and enjoy bath bombs that fizzy and pop as they dissolve in your bath. Rainbow Popping Bath Bombs Kit allows kids to create their own bath bombs by putting the mix into the mold then filling it with popping crystals and adding a top to make the bath bomb. Shimmer n Sparkle Rainbow Popping Bath Bombs kit is great for ages 8 and up. Rainbow Popping Bath Bomb Kit comes with bath bomb mix, popping crystals, scent bottle, 4 piece mold, drying trays, spoon and instructions.