This is another kid friendly project we tried. :) The children drop coloured vinegar onto a tray of baking soda causing a fizzy coloured reaction. All you need is: a large tray or pan, baking soda, food colouring, vinegar, and eye droppers, and your set for some fun!:)
I'd say the best ages for this is three years old and up. My one, and two year olds just made a mess with it. :)
I dyed the vinegar green, orange and blue. Next time, I'll probably let them have more colours. I was thinking they could learn about mixing colours, but this project isn't the greatest for it, as the vinegar didn't mix well after it was in the baking soda.
The kids had a good time, and I was happy that it kept them occupied for a long while. :)