J.K, A., Bergado, J, J., C., J.A, D. V., A., G., G.R., M., & R, Q. (2026). Formulation of Eco-Crayons Using Organic Pigments and Natural Waxes (Soy Wax, Palm Wax, and Beeswax). International Journal of Progressive Research in Science and Engineering, 7(03), 37–46. https://doi.org/10.65138/ijprse.2026.v7i03.1255