The Characteristic Of Biocomposite Film Of Spirulina Residue As Natural Dyes Siti Agustina, Aton Yulianto, Fajriyan, Ahmad Kamil, Eddy Sapto Hartanto and Firda Aulya Syamani E3S Web Conf., 503 (2024) 08002 Published online: 20 March 2024 DOI: 10.1051/e3sconf/202450308002