Acids and Bases 4+
Acids are pink and bases are blue thanks to a bit of cabbage juice. Making red cabbage indicator is stupendously simple.
Buy red cabbage.
Chop up red cabbage, put in bowl.
Pour hot water over red cabbage, let soak.
Strain out red cabbage chunks.
The indicator is a natural purplish tone, and will turn pink in acids, and blue in bases. What colour does it turn in bleach? What happens if you mix a blue and a pink material?