Yves Saint Laurent is introducing his nail polish pairs. Each set contains two de 6-ml polishes. There are six fl ashy colors in the three duos: orange and fuchshia (Duo Rive Gauche), plum and gold (Duo Belle de Nuit), turquoise and violet (Duo Belle de Jour). The idea is so match them for a French manicure or use one color on the hands and the oth...