A simple indicator that turns blue in alkali and red in acid.
References
AQA
- Litmus, pages 129, 241, GCSE Combined Science Trilogy; Chemistry, CGP, AQA
- Litmus, pages 138, 185, GCSE Chemistry; Third Edition, Oxford University Press, AQA
- Litmus, pages 150, 151, 315, GCSE Chemistry, CGP, AQA
- Litmus, pages 153, 234, GCSE Combined Science; The Revision Guide, CGP, AQA
- Litmus, pages 52, 88, GCSE Chemistry; The Revision Guide, CGP, AQA