In my last post, where I featured Octavian’s suggestions for reproducing the smell of wisteria, I forgot to mention that it’s necessary to reproduce the scent of wisteria because it’s one of those flowers whose scent cannot be extracted directly. Many of my favorite fragrant flowers fall in this category: lily of the valley, gardenia, tuberose, jasmine, lilac, iris and wisteria. These fragile flowers crumple when exposed to the heat of the steam which is used to distill scent from other hardier flowers (like lavender and rose).
Of course, this didn’t stop people who wanted to capture the scent of these flowers from developing a method to do so. It’s been around since ancient times and it’s called enfleurage, a name which is actually much prettier than the process.
In its most developed form, as practiced in Grasse, the perfume center of France, during the nineteenth century, fresh flower petals are placed on panes of glass which are smeared with purified fat. The fat absorbs the odors of the flowers, which are replenished when they are spent, until the fat is thoroughly imbued with fragrance. Then the scented fat, which is called a pomade, is washed with alcohol which absorbs the scent. The leftover scented fat was often used to make soap. The scented alcohol is called an absolute. If the alcohol is allowed to evaporate, what is left is an essential oil.
There are more primitive ways of creating the same effect, including simply stirring flowers into hot fat until it absorbs their odors. This cheerful article at Mother Earth News explains how to do enfleurage in your kitchen. I’m not sure I agree that you can use rubbing alcohol; I believe my Natural Perfumery teacher (Jeanne Rose) would shudder at this, because rubbing alcohol has a strong odor of its own which would affect your end result.
The illustration of women handling the chassis used in the enfleurage process comes from Sacred Earth which also explains the process, along with other methods used to extract scent from flowers.
