Aside from the desire of many to simply collect (indeed, there appears to be quite the market out there just for the empty bottles than once contained the precious liquids), a strong reason for buying vintage perfume may simply be that it is discontinued, and getting an old bottle may be the only option. An even stronger reason has to do with reformulation. Perfume formulas change for various reasons, including budget constraints, raw material scarcity, changes in business ownership, and, sadly and increasingly, bans on certain ingredients. Read on to find out how to get your nose on some great oldies but goodies.