SECRET #5- DARK, GOLDEN TONES GIVE THE GREATEST GLOW:  "They reflect more light than pale, cool colors do," says Kyle White, a senior colorist at the Oscar Blandi Salon in New York City.  He recommends warming up your hue when it starts to look dull with color-enhancing shampoos and conditioners, like those by ArTec and Oscar Blandi, which deposit moisturizing color polymers and easily wash out.