Lacmoid is primarily used as a pH indicator in analytical chemistry. It exhibits a distinct color change in response to variations in acidity or alkalinity, making it valuable in titration experiments and pH monitoring. Its application is especially useful in educational laboratories for demonstrating acid-base reactions due to its clear and observable color transition. Additionally, Lacmoid can be employed in environmental testing to assess the pH of water samples, contributing to water quality analysis. Its stability and sensitivity in specific pH ranges enhance its reliability for qualitative assessments in various chemical and biological systems.