NANSU, Worraphol, Passarawan CHAIWUT, Sukunya ROSS, Gareth ROSS, Nungruthai SUPHROM, and Sararat MAHASARANON. 2021. “Developments of Biodegradable Polymer Based on Polylactic Acid (PLA) With Natural Color Extracts for Packaging Film Applications”. Journal of Metals, Materials and Minerals 31 (3). Bangkok, Thailand:127-33. https://doi.org/10.55713/jmmm.v31i3.1147.