The colour-correcting shade has become the go-to trick for pro makeup artists over the years. "Green is a complementary tone to red, so it neutralizes pimples, broken capillaries, or an overall ruddiness to the complexion," says Glamsquad Artistic Director Kelli J. Bartlett . "Just be wary of how pigmented the products are that you layer over it. You don't want the green to be visible."