What are natural indicators which can be used to detect basic solutions?

Answer 1

Juice from red cabbage. It turns blue in a basic solution. Even green when the pH is high enough.

You can also use juice from almost any red flower or fruit like roses or cherry's.

Answer 2

Natural indicators like red cabbage juice and turmeric can be used to detect basic solutions. These indicators change color in the presence of bases, turning blue or green for red cabbage juice and yellow for turmeric, indicating the basic nature of the solution.