On the shelves of makeup counters and drugstores sits an array of foundations in various olive, ivory and fair shades. But ...

A blue cosmetic color additive gives darker powder and stick foundations the warmth and depth that current formulations lack.

"They quickly look greyish on the skin if you ... you can also apply a dark eyeshadow to the entire eyelid - and blend it in at the corners. Then gently dab a shimmering blue shade in the centre ...