Perera , Hasith, Shen Hosan, Dasith Wijesekara, Vimukthi Vithanage, and Kaveenga Rasika Koswattage. 2025. “Development and Characterization of a Biodegradable PH Indicator Film Using Plant-Based Pigments”. International Journal of Environment, Engineering and Education 7 (1):61-70. https://doi.org/10.55151/ijeedu.v7i1.193.