However, using high concentrations of black iron oxide for darker foundations results in an unappealing gray and ashy look on the skin. White pigments used to lighten foundations, including zinc ...

However, using high concentrations of black iron oxide for darker foundations results in an unappealing gray and ashy look on the skin. White pigments used to lighten foundations, including zinc oxide ...

Zwerling says pigments, like iron oxide, rarely cause allergic reactions. "Iron oxide has been shown to be the safest pigment," he says. "Anything that is vegetable based, organic, or natural is ...