Another Pinner said: "This kept my 2 year busy for an entire hour and my 4 year old busy for 2 hours! YAY! Drop vinegar tinted with food coloring onto a pan filled with baking soda. Sheer minutes of colorful fizziness!!... Pretty sure we will be doing this soon! GENIUS!
Great for babies and toddlers for fine motor skill building, but also can later be adapted to learn color recognition and making patterns. This is the kind of thing I was talking about @Lisa a Farme / Anne Dreger