What are 2 indicators that can be made by vegetables?

Two indicators that can be made from vegetables are beet juice and red cabbage juice. Beet juice can indicate pH levels, changing color from deep red in acidic conditions to a more neutral tone in alkaline environments. Red cabbage juice, rich in anthocyanins, also serves as a pH indicator, shifting from red in acidic solutions to green or yellow in alkaline conditions. These natural indicators are useful for educational purposes and simple pH testing.