There are two types of perfume in the world: the fast turnover celebrity perfumes, designed to hit the market and make profits before a star’s capital wanes; and the timeless classics, with their expensive ingredients and loyal followings. While the names endure, many of the ingredients and quantities have changed over time.

As the FT recently reported, ingredients and the amounts perfumers are allowed to use are increasingly being restricted by the International Fragrance Association, which regulates the industry.

One reason is the classification of some key ingredients, such as oakmoss – found in perfumes including Guerlain’s Mitsouko – is that they are allergenic. Other restrictions are now being applied to jasmine and ylang ylang.

Read the full article in the Conversation.