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.

Food companies have two years to get red dye No.3 out of their products. But other synthetic dyes have also raised concerns, because of behavioral issues in kids. Here's what parents need to consider.