The synthetic additive found in thousands of food products will now be phased out by 2027, but advocates say the agency's move is long overdue

Red Dye No. 3, also known as erythrosine, is a synthetic food dye that gives foods and drinks a bright red color. It is also sometimes used in oral medicines and dietary supplements. It first was approved for use in food in 1907. It's made from petroleum.

The FDA just announced that it's banning red dye No. 3 from food. Here's what to know about other food dyes—and if they'll get banned too, per a toxicologist.