The US Food and Drug Administration plans to phase out the use of petroleum-based synthetic dyes in the US food supply due to health concerns, Commissioner Dr. Marty Makary announced Tuesday.

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.”