SIRIRAK, J.; SUPPHARATTHANYA, P.; CHANTHA, K. .; GIRDTHEP, S.; CHAYABUTRA, S. Eco-friendly lake pigment from sappanwood: Adsorption study and its application as natural colorant for natural rubber toy balloon . Journal of Metals, Materials and Minerals, Bangkok, Thailand, v. 31, n. 2, p. 27-37, 2021. Disponível em: http://jmmm.material.chula.ac.th/index.php/jmmm/article/view/1009. Acesso em: 25 oct. 2021.