Labdanum, a type of rock rose, is a base note and excellent fixative that's as old as the Pyramids — in fact, the pharoahs' false beards were made from hair soaked in this sweet, woody amber resin. Labdanum is present in many modern scents, and has become a frequent substitute for the animal-unfriendly base note ambergris. If you're looking for something that sticks to your skin, lasts all day, and has a complex sweetness, a labdanum-based fragrance might be a good option. Prada Beauty ($115) is a sexy, complex labdanum scent. There's also Sage Machado's Amber ($68), which lightens things up with blood orange and musk for an easier-to-wear take.

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