To capture the scent of a flower you have to pick it — about 100 kilograms of them for 25 grams of rose attar. Unfortunately, flowers don’t smell the same dead as alive. Within 15 seconds of being picked, the mixtures of 60 so different molecules that contribute to its smell begin to change. Moreover, volatile essential oils formed by these molecules continue to evaporate and are not replaced. That is why some experts dealing with fragrance put glass jars over individual blossoms to absorb all the chemicals they give off. The chemicals are then analyzed and their synthetic version is made in the lab.