Biswas, G., and T. K. Chatterjee. “Occurrence of Trace Toxic Metals in Commercial Food Colours”. The Indian Journal of Nutrition and Dietetics 29, no. 9 (September 1, 1992): 298–300. Accessed May 3, 2024. https://informaticsjournals.com/index.php/ijnd/article/view/8338.