I did this activity with my son and he enjoyed it. Although, what I did was follow the directions in the video that accompanies that activity vs the actual instructions they give you. Meaning I used a small bag (sandwich bag) inside a larger bag (freezer bag) like they do in the video instead of a tissue inside a bag which is what the instructions tell you to do. It just seemed easier to manage and allowed my son to be the one to pop open the inside bag and actually start the reaction. Also, my son insisted on adding food coloring which they did in the video.