1. Color Additives Questions and Answers for Consumers;US FDA,2018
2. Summary of Color Additives for Use in the United States in Foods, Drugs, Cosmetics, and Medical Devices;US FDA,2017
3. Food colors: Existing and emerging food safety concerns
4. Seeing Red: Time for Action on Food Dyes
https://cspinet.org/resource/seeing-red-time-action-food-dyes
5. Code of Federal Regulations Title 21;US FDA,2022