One purple cabbage, chopped up and soaked in boiling water.
Strain - voila, indicator!
Mummy may like to over organise things a little... but it looks pretty :-)
Add kids, mix and enjoy!
Ranking the results:
Big Brother wanted to test some more things too, so we added toothpaste, hand soap, milk, apple juice, mandarin juice and yoghurt.
On discovering that coke, apple juice and mandarins are all acidic, but toothpaste is slightly alkaline, Big Brother thought of a reason why cleaning his teeth is a good idea.