A red food dye that is ubiquitous in American drinks, snacks, candies and cereals may finally be banned by the federal government after years of concern that it has adverse health impacts, particularly upon children.The federal Food and Drug Administration (FDA) has said that it could soon act to crack down upon the additive known as red 3, derived from petroleum and used to provide a cherry-red coloring to an array of foods.“With red 3, we have a petition in front of us to revoke the authorizat...