Used primarily to detect the presence of oxidizing agents such as chlorine, bromine, ozone, and peroxides (e.g., hydrogen peroxide). When exposed to these substances, the paper changes color, typically from white to blue-black, providing a quick and visible indication. Commonly employed in water treatment facilities to monitor disinfection processes, ensuring the effective removal of harmful microorganisms. Also utilized in laboratories for qualitative analysis to identify oxidizing agents in various chemical solutions. In industrial settings, it helps in safety checks by detecting leaks or spills of oxidizing chemicals. Additionally, it finds application in educational demonstrations to visually illustrate chemical reactions involving oxidizers.