We made some fizzy pavement paint from quirkymama.com
It was excellent fun! Mix cornflour, bicarbinate of soda, food colouring and hot water.
Take it outside, and paint the patio.
Spray the paintings with white vinegar and watch it bubble and fizz!
After we'd had enough of the painting and spraying, Freddie poured vinegar into the paint pots, and made bubbly cauldrons.
What was left when we had finished.