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You want your perfume to be unforgettable so that he keeps thinking about you for the few minutes your scent lingers after you have gone. The scent should be strong enough keep you on his mind but subtle enough that he has to get close to you to smell it. You don't, however, want the smell of rank, expired perfume to smack him in the face from across the room. When everyone is wondering 'What is that smell?" you don't want to be the answer. It is important to keep your perfume fresh and use it before its fragrance changes. Estee Lauder perfumes are clearly labeled so you know how long you can keep them around before it is time for a replacement.
Turn the box the perfume came in so that you are looking at the back of the box. In the bottom right corner, find the picture of an open jar. This will be next to the name of the manufacturer or distributor.
Read the code inside the jar logo. This will tell you how long the perfume will last once you have opened it. For example, an open jar with "24M" in it should be used within 24 months of opening.
When in doubt, dispose of products that have been shelved more than three years. Estee Lauder uses a 3 character batch code to identify where and when perfume was made. The first character in this three character code tells you where the product was made. The last two characters denote a date and a year. A number refers to all months that have one digit while the letters A, B and C denote October, November and December, respectively. A box with a batch code of 35 was manufactured in March of 2005 while one coded B6 was made in November of 2006.
The three year rule generally works well. you can, however, use a jar of perfume that is more than three years old if it has not yet been opened and still smells good when it is.