The Food and Drug Administration is facing some backlash from hedge fund manager Bill Ackman about how long it took to ban Red No. 3 from the U.S. supply chain.

What to know about Red Dye No. 40 and artificial food coloring used in thousands of food and drink products sold in the U.S.

Following the U.S. Food and Drug Administration's (FDA) order banning the use of Red Dye No. 3 in food products, Illinois Secretary of State Alexi Giannoulias renewed his call for an overhaul of the rules governing food additives to eliminate toxic chemicals from the food supply,