EVALUATION OF VEGETABLE EXTRACTS FROM THE SEMI-ARID AS NATURAL pH INDICATOR. HOLOS, [S. l.], v. 1, p. 3–12, 2015. DOI: 10.15628/holos.2015.1868. Disponível em: https://periodicos-treinamento.ifrn.edu.br/index.php/HOLOS/article/view/1868. Acesso em: 28 out. 2026.