Foods that contain petroleum-based dyes are usually ultra-processed and, as a result, they have food labels. These dyes are usually listed on the ingredient label, typically near the end, with names like “Red 40,” “Yellow 5,” or “Blue 1.”

The FDA announced it would phase out all petroleum-based synthetic dyes from the United States' food supply and medications.

FDA to establish national standard and timeline for food industry to transition from petrochemical-based dyes to natural alternatives