experiment to work you need an air tight seal everywhere :) have fun.
we all loved this! lots of food coloring and glitter for the girls... the more baking soda, the bigger and faster the pop. we learned to lay down the bombs, tossing them would result in small tears in the bags that ruined the fun. went through a whole gallon of vinegar and a 2 pound box of baking soda. if we had more materials, we would have kept going! 