Perfume

====Basic framework====
Perfume oils usually contain tens to hundreds of ingredients and these are typically organized in a perfume for the specific role they will play. These ingredients can be roughly grouped into four groups:
*''Primary scents'' (Heart): Can consist of one or a few main ingredients for a certain concept, such as "rose". Alternatively, multiple ingredients can be used together to create an "abstract" primary scent that does not bear a resemblance to a natural ingredient. For instance, jasmine and rose scents are commonly blends for abstract floral fragrances. [[Cola]] flavourant is a good example of an abstract primary scent.
*''Modifiers'': These ingredients alter the primary scent to give the perfume a certain desired character: for instance, fruit [[ester]]s may be included in a floral primary to create a fruity floral; [[calone]] and citrus scents can be added to create a "fresher" floral. The cherry scent in cherry cola can be considered a modifier.
*''Blenders'': A large group of ingredients that smooth out the transitions of a perfume between different "layers" or bases. These themselves can be used as a major component of the primary scent. Common blending ingredients include [[linalool]] and hydroxycitronellal.
*''Fixatives'': Used to support the primary scent by bolstering it. Many resins, wood scents, and amber bases are used as fixatives.

The top, middle, and base notes of a fragrance may have separate primary scents and supporting ingredients. The perfume's [[fragrance oil]]s are then blended with [[Ethanol|ethyl alcohol]] and water, aged in tanks for several weeks and filtered through processing equipment to, respectively, allow the perfume ingredients in the mixture to stabilize and to remove any sediment and particles before the solution can be filled into the perfume bottles.<ref name=cbyear>{{Cite book| first=Chandler| last=Burr| title=The Perfect Scent: A Year Inside the Perfume Industry in Paris & New York| publisher=Henry Holt and Co.| year=2008| isbn=978-0-8050-8037-7| url=https://archive.org/details/perfectscentyear00burr}}</ref>