OUALID, BAGHRICHE, DJEBBAR KAMEL, DEBBACHE NADRA, SEHILI TAHAR, and BOUCHOUL ABDELKADER. 2010. “Dicolouration of Congo Red Dye by Activated Carbon in Aqueous Medium”. Asian Journal of Chemistry 19 (7):5319-30. https://asianpubs.org/index.php/ajchem/article/view/13136.