Nainggolan, B., & Agrevinna, M. (2026). The DEVELOPMENT OF A DIGITAL GUIDEBOOK FOR SPICE BLENDS USED IN KARO BATAK TRADITIONAL OUKUP TREATMENT. Journal of Beauty Science and Applied Cosmetology, 2(1), 35–41. https://doi.org/10.21831/jbsac.v2i1.2790