Pasu, Charusiri, and Irena Vanessa Gunawan. “Possibility of Implementing the Usage of Plants As Colouring Agents for Hard Element”. Environment-Behaviour Proceedings Journal 9, no. SI23 (October 31, 2024): 225–231. Accessed March 22, 2026. https://ebpj.e-iph.co.uk/index.php/EBProceedings/article/view/6169.