PASU, C.; GUNAWAN, I. V. Possibility of Implementing the Usage of Plants as Colouring Agents for Hard Element. Environment-Behaviour Proceedings Journal, [S. l.], v. 9, n. SI23, p. 225–231, 2024. DOI: 10.21834/e-bpj.v9iSI23.6169. Disponível em: https://ebpj.e-iph.co.uk/index.php/EBProceedings/article/view/6169. Acesso em: 7 oct. 2025.