Kurnianingsih, Andi, and Supriadi Supriadi. 2022. “Analysis of Potassium (K) Levels in the Red Betel Leaf (Piper Crocatum Ruiz &Amp; Pav) Using Spectrophotometry Method”. Media Eksakta 18 (1):58-63. https://doi.org/10.22487/me.v18i1.1501.