Ulos batak natural dye paste from salaon leaf extract (Indigofera tinctoria L), ketapang leaf (Terminalia catappa), and cocoa fruit peel (Theobroma cacao L). J.Pendidik.Kim [Internet]. 2023 Apr. 18 [cited 2026 Mar. 26];15(1):29-34. Available from: https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/38358