With what it takes to make synthetic ... just a variety of corundum, or aluminum oxide. Where sapphire gets its blue tint mainly from iron, rubies get their pink to blood-red hue from chromium.

Red No. 3 is a synthetic dye that gives candies, sodas, and some medications their cherry hue. "The FDA cannot authorize a food additive or color additive if it has been found to cause cancer in ...