Litmus is widely used as a pH indicator in various scientific and industrial applications. It is particularly valuable in laboratories for determining whether a solution is acidic or basic. When added to a solution, litmus changes color: it turns red in acidic conditions (pH below 7) and blue in alkaline conditions (pH above 7). This property makes it a simple and effective tool for quick pH testing in educational settings, research labs, and quality control processes. Additionally, litmus paper, which is impregnated with litmus solution, is a portable and convenient method for on-the-spot pH testing in fields such as environmental monitoring, food production, and water treatment. Its ease of use and reliability have made it a staple in chemistry for both qualitative and semi-quantitative analysis.