Wardatun, Sri, Siti Mahyuni, and Jeni Sri Mulyani. 2025. “The Effect of Ethanol Polarities on Tannin Content of Persea Americana Mill Seeds Extract Using Gelatin Precipitation Method”. Helium: Journal of Science and Applied Chemistry 4 (2):72-77. https://doi.org/10.33751/helium.v4i2.10.