J.K A, Bergado, J, J. C, J.A DV, A. G, G.R. M, R Q. Formulation of Eco-Crayons Using Organic Pigments and Natural Waxes (Soy Wax, Palm Wax, and Beeswax). IJPRSE [Internet]. 2026 Mar. 31 [cited 2026 Apr. 1];7(03):37-46. Available from: https://journal.ijprse.com/index.php/ijprse/article/view/1255