Pros offer tips on how to pick a foundation

NEW YORK (AP) -- Foundation can be your best friend, perfecting skin tone and creating a flawless canvas for other makeup. But if you choose the wrong shade or apply it sloppily, it can become your worst enemy, in the form of the dreaded two-tone "base line."
In its February issue, Cosmopolitan magazine offers the following pointers for picking the best base:
UChoose a yellow-based foundation whether your skin has pink or yellow undertones, Cosmo's beauty pros say. A yellow-based tint creates a warm complexion, so if you're deciding between hues, pick the more golden of the two.
UTake the colors for a "test drive." Apply three different shades to your face, then go outside and see how they look in natural light. Despite what the ladies at the cosmetic counter say, never test foundation on your hands because their shade and texture are different than your face's.
UBring an old bottle of foundation with you when you shop to help you find a new hue that matches a shade that's worked in the past.