Cornstarch is a silky powdery starch made from corn. In Britian, it is sometimes referred to as Corn Flour. Use cornstarch in body powders, cosmetics, milk baths and bath bombs to add silkiness and to soothe the skin. Cornstarch is a safer alternative than using talc on babies. It can be added to diaper area barrier creams to keep the skin dry and protected from moisture. When used in water-based formulations, cornstarch will act as a thickener.