Norazreen Sharip, Siti Nazirah Abdul Malek, Nurul Fatihah Syahronie, & Nurish Alysa Sofea Roslan. (2026). Synthesis of Eco-Friendly Inks from Waste Cooking Oil: Evaluating the Properties of Charcoal and Butterfly Pea Flower Formulations . Future Energy and Environment Letters , 7(1), 1–7. Retrieved from https://karyailham.com.my/index.php/feel/article/view/1126