Rafly Ramadhani Santoso; Sheira Putri Anjani; Ferra Naidir. Synthesis and Characterization of Solid Soap Based on Avocado Seed Oil (Persea Americana) With the Addition of Betel Leaf Extract (Piper Betle) As a Natural Antiseptic Active Ingredient. Ambidextrous 2026, 5, 315-327.