kurda, A.H. 2025. A SPECTROSCOPIC IN-VITRO METHOD FOR DETERMINING THE SUN PRODUCTION FACTOR (SPF)AND PHYSICAL PROPERTIES OF MARKETED SUNSCREEN FORMULATIONS. Science Journal of University of Zakho. 13, 1 (Jan. 2025), 18–24. DOI:https://doi.org/10.25271/sjuoz.2025.13.1.1372.