What is the difference between aftershave and eau de toilette?

"Aftershave is designed for use on the face," says Annette Green, President of The Fragrance Foundation. "Its primary function is to soothe and refresh rather than deliver lasting fragrance. A cologne, which is equivalent in strength to a lady's eau de toilette, is longer lasting and delivers a more concentrated formula that is used on the body."

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How long should fragrance last in a bottle? Can I keep it in the refrigerator to make it last longer?

Your fragrance should last six months to a year if kept out of direct light and closed tightly to avoid oxidation and evaporation, according to Annette Green of The Fragrance Foundation.

Contrary to popular belief, refrigeration does not extend the life of fragrance and, in fact, will disrupt the delicate balance of perfume and eau de parfum, and should be avoided. For the refreshing feel of a chilled fragrance, you can put aftershave or cologne in the fridge.

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I want to buy my father a bottle of cologne but he says he's allergic to many fragrances. Is there anything that he can wear?

According to Annette Green, most people tend to be less sensitive to light green or citrus scents. A good rule of thumb is "the lighter, the better."

Allergies and sensitivities are so specific to the individual that it is difficult to be absolutely certain of your choice. The best way to be confident of your selection is to test the fragrance in question.

Apply the fragrance to the inside of your father's wrist or on the palm of his hand. Within one hour, after interacting with his chemistry, the scent will have developed and he can tell you if the fragrance is acceptable or not.

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How long should a fragrance last on my skin? How can I make it last longer?

According to Annette Green, three hours is a realistic expectation. Layering with soaps, powders, creams and oils followed by an eau de parfum or perfume will extend the wear of the product. Also remember that fragrance fades much quicker in a high altitude or cool climate, but can be much richer or bolder in a warm, tropical environment.

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My friend sprays fragrance in her hair because she thinks it lasts longer. Is this OK?

On the contrary! According to Annette Green of The Fragrance Foundation, the oils on your scalp can intensify and distort a fragrance. In addition, the alcohol in the fragrance may be drying to your hair.

If your friend wants a longer-lasting scent, tell her to apply perfume to the pulse points - ankles, behind the ears, back of the knees, bosom, inside the wrist and inside the elbows - to extend wear.