NORAZREEN SHARIP; SITI NAZIRAH ABDUL MALEK; NURUL FATIHAH SYAHRONIE; NURISH ALYSA SOFEA ROSLAN. Synthesis of Eco-Friendly Inks from Waste Cooking Oil: Evaluating the Properties of Charcoal and Butterfly Pea Flower Formulations . Future Energy and Environment Letters , [S. l.], v. 7, n. 1, p. 1–7, 2026. Disponível em: https://karyailham.com.my/index.php/feel/article/view/1126. Acesso em: 26 jul. 2026.