Harputpong, Pattiya, Eakachat Joneurairatana, and Veerawat Sirivesmas. 2025. “Plant-Based Solutions for Metalcraft: Alternative Non-Toxic Copper Patination Method from Thai Fruits and Vegetables”. Journal of Fine and Applied Arts Khon Kaen University 17 (2). Khon Kaen, Thailand:50-73. https://so02.tci-thaijo.org/index.php/fakku/article/view/271591.