The U.S. Food and Drug Administration on Monday approved the use of a new blue color additive from the gardenia fruit the fourth coloring from natural sources added in the last two months.

According to today's announcement from the FDA, an estimated 40% of the food industry has committed to voluntarily phasing out petroleum-based dyes. That includes major brands like Heinz and General Mills, both of which promised this June to start removing synthetic dyes from their products.

Months after the FDA approved three natural food additives, it's added another to the list. Experts share what parent should know.