Food manufacturers use food colors to create fantastic colors for candy, soda, and chips, but food coloring can also be added to fresh foods to give them a more "natural" look, or to give the consumer what they expect: like more orange oranges!
Today it is often used in some protein foods as tuna or meat to enhance the color, appearance and make the product look fresh.
Often, but unfortunately not always, food dyes are listed on food labels with a number next to them; these are commercially produced dyes approved by the FDA.