Aisha Mohammed Hamza, and Dr. Dheaa Shamikh Zageer. “Natural Dyes As PH Indicator: A Review”. AL-Yarmouk Journal 21, no. 2 (April 21, 2026): 22–29. Accessed July 29, 2026. https://journal.al-yarmok.edu.iq/index.php/alyj/article/view/1348.