Fernandes Eça, Gilmara, Lorena Pereira Araújo, Simone Fiuza Conceição, Alan Freitas dos Santos, Márcio Cunha dos Santos, Rayza Pereira Santos, and Breno do Nascimento Silva. 2024. “Use of an Alcoholic Solution of Flower Pigments As a Natural PH Indicator in aqueous solutions”. Electronic Journal of Exact and Technological Sciences 5 (1). https://periodicos.ufrb.edu.br/index.php/recet/article/view/4748.