Teacher had a red cabbage in school with her today.
If you cut up a leaf and add very hot water the purple colour will start to run from the cabbage.
This red cabbage water is amazing!
It can help tell if something is an acid or an alkali (or neither).
We noticed the cabbage water turn pink or red with vinegar, lemon juice, orange juice, orange and pineapple juice, black current juice, and most surprisingly of all, with tea!
Bread soda did not make the cabbage water turn red or pink. Instead it made the cabbage water turn a bluey-green.
This is because bread soda is an alkali (and therefore good for cleaning!)
We wondered what would happen if we mixed an alkali with an acid. What colour would the water turn?