J. SIRIRAK, P. SUPPHARATTHANYA, K. . CHANTHA, S. GIRDTHEP, and S. CHAYABUTRA, “Eco-friendly lake pigment from sappanwood: Adsorption study and its application as natural colorant for natural rubber toy balloon ”, J Met Mater Miner, vol. 31, no. 2, pp. 27–37, Jun. 2021.