Instead of building a perfume from "ground up", many modern perfumes and colognes are made using fragnance bases or simply bases. Each base is essentially modular perfume that is blended from essential oils and aromatic chemicals, and formulated with a simple concept such as "fresh cut grass" or "juicy sour apple". Many of Guerlain's Aqua Allegoria line, with their simple fragnance concepts, are good examples of what perfume fragnance bases are like. The effort used in developing bases by fragnance companies or individual perfumers may equal that of a marketed perfume, since they are useful in that they are reuseable. On top of its reusability, the benefit in using bases for construction are quite numerous:
1. Ingredients with "difficult" or "overpowering" scents that are tailored into a blended base may be more easily incoporated into a work of perfume.
2. A base may be better scent approximation of a certain thing than the extract of the thing itself. For example, a base made to embody the scent for "fresh dewy rose" might be a better approximation for the scent concept of a rose after rain than plain rose oil. Flowers whose scents cannot be extracted, such as gardenia or hyacinth, are composed as bases from data derived from headspace technology.
3. Aperfumer can quickly rough out a concept from a brief by cobbling together multiple bases, then present it for feedback. Smoothing out the "edges" of the perfume can be done after a positive response.
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