We've done this activity before and it was a hit. All you do is pour baking soda into a pan then put vinegar in a couple different cups with some food coloring. For droppers I used some old food coloring containers and a medicine dropper. Then Little Lady "painted" to her hearts desire a beautiful fizzing masterpiece. When the vinegar hits the baking soda it fizzes and gets all bubbly. It is quite fun to watch. If you touch it after it settles it kinda feels like a sponge. We kept painting until all the white was colored and covered in fizz. Then we poured all the leftover vinegar on top of it and had one more big fizzy moment!
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