“Extraction of Anthocyanins from Purple Cabbage (brassica Oleracea) and Red Onion (allium Cepa) As Substitutes for Synthetic Ph Indicators of Origin ”. Cuadernos de Semilleros de investigación 7, no. 1 (January 1, 2019): 22–32. Accessed May 18, 2024. https://revistas.uniagraria.edu.co/index.php/csi/article/view/54.