litmus
/ˈlɪtməs/
noun
- A test or indicator that reveals the true nature or status of something.
- The election results were a litmus test for the popularity of the new policy.
- Her reaction to the news served as a litmus for her true feelings.
- Customer satisfaction is often used as a litmus for business success.
- A dye obtained from lichens that changes color in acid or base solutions, used as a chemical indicator.
- The chemistry teacher used litmus paper to test whether the liquid was an acid or a base.
- Litmus turns red in acidic solutions and blue in alkaline ones.
- They dipped a strip of litmus into the beaker to check the pH level.