Next month, Yves Saint Laurent will launch Le Teint Touche Eclat, which is said to pick up where YSL’s classic foundation, Touche Eclat Radiant Touch, left off. Unlike traditional foundation formulas, which contain opaque powders that can make skin look dull, and mother-of-pearl pigments that may reflect light like mirrors, Le Teint contains has a “soft-focus gel” with a translucent texture said to smooth imperfections while ensuring skin’s color purity. There is also a “fluid ligh...