Preserving perfume

Fragrance compounds in perfumes will degrade or break down if improperly stored in the presence of:

• Heat
• Light
• Oxygen
• Extraneous organic materials

Proper preservation of perfumes involve keeping them away from sources of heat and storing them where they will not be exposed to light. An opened bottle will keep its aroma intact for up to a year, as long as it is full or nearly so, but as the level goes down, the presence of oxygen in the air that is contained in the bottle will alter the perfume's smell character, eventually distorting them.

Perfumes are best preserved when kept in light-tight aluminium bottles or in their original packaging when not in use, and refrigerated at a relatively low temperatures between 3-7 degrees Celsius. Although it is difficult to completely remove oxygen from the headspace of a stored flask of fragrance, opting for spray dispensers instead of rollers and "open" bottles will minimize oxygen exposure. Sprays also have the advantage of isolating fragrance inside a bottle and preventing it from mixing with dust, skin, and detritus, which will degrade and alter the quality of a perfume

History of Perfume

Egyptian scene depicting the preparation of Lily perfume

The history of perfume began in antiquity. The word perfume used today to describe scented mixtures, derives from the Latin "per fume", meaning through smoke. Perfumery, or the art of making perfumes, began in ancient Egypt but was developed and further refined by the RomansArabs. Although perfume and perfumery also existed in East Asia, much of its fragrances are incense based. and the

Cyprus

To date, the oldest perfumery was discovered on the island of Cyprus. Excavations in 2004-5 under the initiative of an Italian archaeological team unearthed evidence of an enormous factory that existed 4,000 years ago during the Bronze Age. This covered an estimated surface area of over 4,000m² indicating that perfume manufacturing was on an industrial scale. The news of this discovery was reported extensively through the world press and many artifacts are already on display in Rome.

Islamic

Islamic cultures contributed significantly in the development of western perfumery in both perfecting the extraction of fragrances through steam distillation and introducing new, raw ingredients. Both of the raw ingredients and distillation technology significantly influenced western perfumery and scientific developments, particularly chemistry.

As traders, Islamic cultures such as the Arabs and Persians had wider access to different spices, herbals, and other fragrance material. In addition to trading them, many of these exotic materials were cultivated by the Muslims such that they can be successfully grown outside of their native climates. Two examples of this include jasmine, which is native to South and Southeast Asia, and various citrus, which are native to East Asia. Both of these ingredients are still highly important in modern perfumery.

In Islamic culture, perfume usage has been documented as far back as the 6th century and its usage is considered a religious duty. Muhammad said:

“

The taking of a bath on Friday is compulsory for every male Muslim who has attained the age of puberty and (also) the cleaning of his teeth with Miswaak (type of twig used as a toothbrush), and the using of perfume if it is available. (Recorded in Sahih Bukhari).

”

Such rituals gave incentives to scholars to search and develop a cheaper way to produce incenses and in mass production. Thanks to the hard work of two talented chemists: Jabir ibn Hayyan (born 722, Iraq), and al-Kindi (born 801, Iraq) who established the perfume industry. Jabir developed many techniques, including distillation, evaporation and filtration, which enabled the collection of the odour of plants into a vapour that could be collected in the form of water or oil.

Al-Kindi, however, was the real founder of perfume industry as he carried out extensive research and experiments in combining various plants and other sources to produce a variety of scent products. He elaborated a vast number of ‘recipes’ for a wide range of perfumes, cosmetics and pharmaceuticals. His work in the laboratory is reported by a witness who said:

“

I received the following description, or recipe, from Abu Yusuf Ya'qub b. Ishaq al-Kindi, and I saw him making it and giving it an addition in my presence.

”

The writer goes on in the same section to speak of the preparation of a perfume called ghaliya, which contained musk, amber and other ingredients; too long to quote here, but which reveals a long list of technical names of drugs and apparatus.

Eggs and floral perfumes were brought to Europe in the 11th and 12th centuries from Arabia, through trade with the Islamic world and with the returning Crusaders. Those who traded for these were most often also involved in trade for spices and dyestuffs. There are records of the Pepperers Guild of London, going back to 1179; which show them trading with Muslims in spices, perfume ingredients and dyes.

Western

Knowledge of something perfumery came to Europe as early as the 14th century due partially to Arabic influences and knowledge. But it was the Hungarians who ultimately introduced the first modern perfume. The first modern perfume, made of scented oils blended in an alcohol solution, was made in 1370 at the command of Queen Elizabeth of Hungary and was known throughout Europe as Hungary Water. The art of perfumery prospered in Renaissance Italy, and in the 16th century, Italian refinements were taken to France by Catherine de Medicis personal perfumer, Rene le Florentin. His laboratory was connected with her apartments by a secret passageway, so that no formulas could be stolen en route.

France quickly became the European center of perfume and cosmetic manufacture. Cultivation of flowers for their perfume essence, which had begun in the 14th century, grew into a major industry in the south of France. During the Renaissance period, perfumes were used primarily by royalty and the wealthy to mask body odors resulting from the sanitary practices of the day. Partly due to this patronage, the western perfumery industry was created. Perfume enjoyed huge success during the 17th century. Perfumed gloves became popular in France and in 1656, the guild of glove and perfume-makers was established. Perfumers were also known to create poisons; for instance, a French duchess was murdered when a perfume/poison was rubbed into her gloves and was slowly absorbed into her skin.

Perfume came into its own when Louis XIV came to the throne in the 18th century. His court was called "le cour parfumee" (the perfumed court). Madame de Pompadour ordered generous supplies of perfume, and King Louis demanded a different fragrance for his apartment everyday. The court of Louis XIV was even named due to the scents which were applied daily not only to the skin but also to clothing, fans and furniture. Perfume substituted for soap and water. The use of perfume in France grew steadily. By the 18th century, aromatic plants were being grown in the Grasse region of France to provide the growing perfume industry with raw materials. Even today, France remains the centre of the European perfume design and trade.

After Napoleon came to power, exorbitant expenditures for perfume continued. Two quarts of violet cologne were delivered to him each week, and he is said to have used sixty bottles of double extract of jasmine every month. Josephine had stronger perfume preferences. She was partial to musk, and she used so much that sixty years after her death the scent still lingered in her boudoir.

England

Perfume reached its peak in England during the reigns of Henry VIII and Queen Elizabeth I. All public places were scented during Queen Elizabeth's rule, since she could not tolerate bad smells. It was said that the sharpness of her nose was equal led only to the slyness of her tongue. Ladies of the day took great pride in creating delightful fragrances and they displayed their skill in mixing scents.

As with industry and the arts, perfume was to undergo profound change in the 19th century. Changing tastes and the development of modern chemistry laid the foundations of perfumery as we know it today. Alchemy gave way to chemistry and new fragrances were created. The French Revolution had in no way diminished the taste for perfume, there was even a fragrance called "Parfum à la Guillotine". Under the post-revolutionary government, people once again dared to express a penchant for luxury goods, including perfume. A profusion of vanity boxes containing perfumes appeared in the 19th century.

In early America, the first scents were colognes and scented water. Florida water, an uncomplicated mixture of eau de cologne with a dash of oil of cloves, cassia, and lemongrass, was popular.

Composing perfumes

Perfume compositions are an important part of many industries ranging from the luxury goods sectors, food services industries, to manufacturers of various household chemicals. The purpose of using perfume or fragrance compositions in these industries is to affect customers through their sense of smell and entice them into purchasing the perfume or perfumed product. As such there is significant interest in producing a perfume formulation that people will find aesthetically pleasing.

The Perfumer

The job of composing perfumes that will sell is left up to an expert on perfume composition or known in the fragrance industry as the perfumer. They are also sometimes referred to affectionately as "the Nose" due to their fine sense of smell and skill in smell composition. The perfumer is effectively an artist who is trained in depth on the concepts of fragrance aesthetics and who is capable of conveying abstract concepts and moods with their fragrance compositions. At the most rudimentary level, a perfumer must have a keen knowledge of a large variety of fragrance ingredients and their smells, and be able to distinguish each of the fragrance ingredients whether alone or in combination with other fragrances. As well, they must know how each ingredient reveals itself through time with other ingredients. The job of the perfumer is very similar to that of flavourists, who compose smells and flavourants for many commercial food products. The composition of a perfume typically begins with a brief by the perfumer's employer or an outside customer. The customers to the perfumer or their employers, are typically fashion houses or large corporations of various industries. Each brief will contain the specifications for the desired perfume, and will describe in often poetic or abstract terms what the perfume should smell like or what feelings it should evoke in those who smell it, along with a maximum per litre price of the perfume oil concentrate. This allowance, along with the intended application of the perfume will determine what aromatics and fragrance ingredients can/will be used in the perfume composition. The perfumer will then go through the process of blending multiple perfume mixtures and will attempt to capture the desired feelings specified in the brief. After presenting the perfume mixtures to the customers, the perfumer may "win" the brief with their approval, and proceed to sell the formulation to the customer, often with modifications of the composition of the perfume. This process typically spans over several months to several years. The perfume composition will then be either used to enhance another product as a functional fragrance (shampoos, make-up, detergents, car interiors, etc.), or marketed and sold directly to the public as a fine fragrance. Alternatively, the perfumer may simply be inspired to create a perfume and produce something that later becomes marketable or successfully wins a brief. This usually happens in smaller or independent perfume houses.

Technique

Although there is no single "correct" technique for the formulation of a perfume, there are general guidelines as to how a perfume can be constructed from a concept.

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: 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 esters 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. Common blending ingredients include linalool and hydroxycitronellal. * Fixatives: Used to support the primary scent by bolstering it. Many resins and wood scents, and amber bases are used for fixative purposes. The top, middle, and base notes of a fragrance may have separate primary scents and supporting ingredients.

Fragrance bases

The perfume's fragrance oils are then blended with ethyl alcohol and water, aged in tanks for a minimum of 14 days and filtered through processing equipment to remove any sediment and particles before the solution can be filled into the perfume bottles. [citation needed] Instead of building a perfume from "ground up", many modern perfumes and colognes are made using fragrance 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 fragrance concepts, are good examples of what perfume fragrance bases are like. The effort used in developing bases by fragrance companies or individual perfumers may equal that of a marketed perfume, since they are useful in that they are reusable. 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 incorporated into a work of perfume 2. A base may be better scent approximations 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. 3. The concept of a perfume can be relatively quickly roughed out from a brief for purposes of feedback by cobbling together multiple bases and presented. Smoothing out the "edges" of the perfume can be done after a positive responses to the perfume concept.

Reverse engineering

Creating perfumes through reverse engineering with analytical techniques such as GC/MS can reveal some of the formula for a particular perfume but most perfumes are difficult to analyze because of their complexity, particularly due to presence of essential oils and other ingredients consisting of complex chemical mixtures. However, "anyone armed with good GC/MS equipment and experienced in using this equipment can today, within days, find out a great deal about the formulation of any perfume... customers and competitors can analyze most perfumes more or less precisely." Recreating perfumes in this manner is very expensive, unless one has access to the same complex ingredients as the original formulators. Furthermore the deliberate addition of inert ingredients to obscure the formula makes identification of components difficult. Antique or badly preserved perfumes undergoing this analysis can also be difficult due to the numerous degradation by-products and impurities that may have resulted from breakdown of the odorous compounds. However, these ingredients and compounds can usually be ruled-out or identified using gas chromatograph (GC) smellers, which allow individual chemical components to be identified both through their physical properties and their scent.

Fragrant extracts

Although fragrant extracts are known to the general public as the generic term "essential oils", a more specific language is used in the fragrance industry to describe the source, purity, and technique used to obtain a particular fragrant extract.

Of these extracts, only absolutes, essential oils, and tinctures are directly used to formulate perfumes.

• Absolute: Fragrant materials that are purified from a pommade or concrete by soaking them in ethanol. By using a slightly hydrophilic compound such as ethanol, most of the fragrant compounds from the waxy source materials can be extracted without dissolving any of the fragrantless waxy molecules. Absolutes are usually found in the form of an oily liquid.
• Concrete: Fragrant materials that have been extracted from raw materials through solvent extraction using volatile hydrocarbons. Concretes usually contain a large amount of wax due to the ease in which the solvents dissolve various hydrophobic compounds. As such concretes are usually further purified through distillation or ethanol based solvent extraction. Concretes are typically either waxy or resinous solids or thick oily liquids.
• Essential oil: Fragrant materials that have been extracted from a source material directly through distillation or expression and obtained in the form of an oily liquid. Oils extracted through expression are sometimes called expression oils.
• Pomade: A fragrant mass of solid fat created from the enfleurage process, in which odorous compounds in raw materials are adsorbed into animal fats. Pommades are found in the form of an oily and sticky solid.
• Tincture: Fragrant materials produced by directly soaking and infusing raw materials in ethanol. Tinctures are typically thin liquids.

Obtaining natural odorants

Before perfumes can be composed, the odorants used in various perfume compositions must first be obtained. Synthetic odorants are produced through organic synthesis and purified. Odorants from natural sources require the use of various methods to extract the aromatics from the raw materials. The results of the extraction are either essential oils, absolutes, concretes, or butters, depending on the amount of waxes in the extracted product.

All these techniques will, to a certain extent, distort the odor of the aromatic compounds obtained from the raw materials. This is due to the use of heat, harsh solvents, or through exposure to oxygen in the extraction process which will denature the aromatic compounds, which either change their odor character or renders them odorless.

• Maceration/Solvent extraction: The most used and economically important technique for extracting aromatics in the modern perfume industry. Raw materials are submerged in a solvent that can dissolve the desired aromatic compounds. Maceration lasts anywhere from hours to months. Fragrant compounds for woody and fibrous plant materials are often obtained in this manner as are all aromatics from animal sources. The technique can also be used to extract odorants that are too volatile for distillation or easily denatured by heat. Commonly used solvents for maceration/solvent extraction include hexane, and dimethyl ether. The product of this process is called a "concrete".
  • Supercritical fluid extraction: A relatively new technique for extracting fragrant compounds from a raw material, which often employs Supercritical CO₂. Due to the low heat of process and the relatively nonreactive solvent used in the extraction, the fragrant compounds derived often closely resemble the original odor of the raw material.
  • Ethanol extraction: A type of solvent extraction used to extract fragrant compounds directly from dry raw materials, as well as the impure oily compounds materials resulting from solvent extraction or enfleurage. Ethanol extraction is not used to extract fragrance from fresh plant materials since these contain large quantities of water, which will also be extracted into the ethanol.
• Distillation: A common technique for obtaining aromatic compounds from plants, such as orange blossoms and roses. The raw material is heated and the fragrant compounds are re-collected through condensation of the distilled vapour.
  • Steam distillation: Steam from boiling water is passed through the raw material, which drives out their volatile fragrant compounds. The condensate from distillation are settled in a Florentine flask. This allows for the easy separation of the fragrant oils from the water. The water collected from the condensate, which retains some of the fragrant compounds and oils from the raw material is called hydrosol and sometimes sold. This is most commonly used for fresh plant materials such as flowers, leaves, and stems.
  • Dry/destructive distillation: The raw materials are directly heated in a still without a carrier solvent such as water. Fragrant compounds that are released from the raw material by the high heat often undergo anhydrous pyrolysis, which results in the formation of different fragrant compounds, and thus different fragrant notes. This method is used to obtain fragrant compounds from fossil amber and fragrant woods where an intentional "burned" or "toasted" odor is desired.
• Expression: Raw material is squeezed or compressed and the oils are collected. Of all raw materials, only the fragrant oils from the peels of fruits in the citrus family are extracted in this manner since the oil is present in large enough quantities as to make this extraction method economically feasible.
• Enfleurage: Absorption of aroma materials into wax and then extracting the odorous oil with ethyl alcohol. Extraction by enfleurage was commonly used when distillation was not possible due to the fact that some fragrant compounds denature through high heat. This technique is not commonly used in the present day industry due to its prohibitive cost and the existence of more efficient and effective extraction methods.