What do you look for in a nail polish shade? Something that complements your skin tone? Or that's on trend? We'd say both. But drugstores are packed with countless colors, so how does one particular shade become the go-to for women of all skin tones and nail goals? Somehow, Terra Coppa by Sally Hansen has become that shade. A shimmery bronze polish with a rosy undertone has become the brand's best-seller. Since its 2014 launch, 32 million bottles have sold in the US—which equals about 10% of our country's population. In other words, it's super-popular. Think of it this way: One bottle has sold since you clicked on this story.