Antonio Mcgowan
The art of perfumery has a rich history, blending science and art. The word 'perfume' is derived from the Latin 'perfumare', meaning 'to smoke through'. Perfumes are made up of molecules, just as humans are made up of cells. The size of these molecules determines how fast they oxidise, and thus, the longevity of a scent. Perfumes are made up of three basic layers of aromatic compounds, or fragrance notes, which evaporate over time. The first layer, or head notes, are highly volatile and usually sweet floral essences. The second layer, or heart notes, are spicy compounds with a lower boiling point. The final layer, or bass notes, are the strongest smells that last the longest on the skin, such as ambergris and other 'amplifier compounds'. Perfumes are created using synthesized chemicals and real scent extractions, with fragrance chemists needing a master's or doctorate in Chemistry or Chemical Engineering to work in the labs.
| Characteristics | Values |
|---|---|
| Basic layers | Aromatic compounds |
| First layer | Head notes, highly volatile, sweet floral essence |
| Second layer | Heart notes, spicy compounds, lower boiling point |
| Third layer | Bass notes, strongest smells, ambergris, other amplifier compounds |
| Raw materials | Flowers, plants, oils, crushed herbs, petals, water vapour |
| Methods | Distillation, maceration, enfleurage |
| Chemicals | Benzyl alcohol, limonene, ethyl alcohol, kashmirin, acetone, ionones, ethanol, ethyl acetate, benzaldehyde, aldehydes |
| Fixatives | Ambergris, synthetic ambroxide |
| Solvent | Ethanol, water, ethanol and water mix |
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What You'll Learn
The history of perfume chemistry
The ancient Egyptians played a significant role in the history of perfume, using scents as a social status symbol and for grooming. They also began trading raw materials for perfume, with incense and myrrh being common fragrance ingredients. The Romans and Greeks further refined the use of perfume, extracting fragrances from diverse sources such as flowers, woods, seeds, roots, saps, and gums. The Romans used saffron in the plaster of a temple dedicated to Athena in Elis, near Olympia, which kept the interior fragrant for 500 years.
In the 9th century, the Arab chemist Al-Kindi wrote the "Book of the Chemistry of Perfume and Distillations," which included over a hundred recipes for fragrant oils and aromatic waters, as well as methods and equipment for perfume-making. The Persians ruled the perfume trade during the Sassanid period (224-651 CE), and Islamic cultures made significant advancements in Middle Eastern perfumery, including the development of steam distillation and the introduction of new raw materials.
The Islamic invasion of Spain and Southern Italy in 711 and 827 CE reinvigorated the art of perfumery in Western Europe. The Islamic-controlled cities of Spain, known as Al-Andalus, became major producers and traders of perfumes. In the 16th century, Catharina de Medici initiated the perfume industry in Europe when she left Italy to marry the French crown prince.
The 19th century marked a profound change in perfume chemistry, with the development of modern chemistry laying the foundations of contemporary perfumery. The first stage in making a perfume is the extraction of fragrant essential oils from plants, typically through distillation. The use of synthetic products in perfumery began in the late 19th century, with the first modern perfume, "Jicky," being created in 1889. Chanel No. 5 was the first perfume to apply modern chemical principles and contain synthetics.
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Common compounds and ingredients
The art of perfumery involves the use of various compounds and ingredients to create captivating scents. While the specific formulas are often closely guarded by perfumers, we can identify some common elements that form the basis of many fragrances.
One of the key components of perfume is aromatic compounds, which provide the fragrance's intensity and longevity. These compounds can be natural or synthetic, with the former being extracted from plants and flowers using techniques like distillation, maceration, and enfleurage. Ancient civilisations used herbs, spices, and flowers like almond, coriander, myrtle, conifer resin, and bergamot to create perfumes. Today, modern perfumery employs a wide range of aromatic compounds, including vanillin and coumarin, to craft complex and enticing scents.
Alcohol, typically in the form of ethanol, is another vital ingredient in perfumes. It acts as a solvent, diluting the fragrance and allowing the individual notes to be distinguished. Alcohol also determines the sillage, or trail, of the perfume, carrying the scent further and enabling sprayable consistency. Additionally, aldehydes, which are organic compounds present in many natural materials, are commonly used in fragrances. These can range from fruity notes to more complex aromas like musk, vanilla, pine, and cinnamon.
Essential oils are also fundamental to perfumery, with citrus oils like bergamot, derived from a hybrid of lemon and orange, being particularly popular. Other essential oils used include rose, sandalwood, and Indian agarwood. Furthermore, fixatives like ambergris or its synthetic alternative, ambroxide, are valued for their ability to prolong the scent's longevity.
The art of perfumery involves blending these compounds and ingredients in precise proportions to create harmonious fragrances. Each scent is crafted to unfold over time, with top, middle, and base notes that evaporate at different rates, providing a multi-layered olfactory experience.
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How perfumes are formulated
The formulation of perfumes is a complex process that involves various steps, from ingredient collection to quality control. It is considered an art form, with perfumers studying scent composition, chords, and raw materials to create unique fragrances. Here is a detailed look at how perfumes are formulated:
Ingredient Collection
The first step in perfume formulation is gathering the necessary ingredients, which can include a wide range of natural and synthetic materials. Natural ingredients may come from plants, fruits, woods, flowers, and even animal secretions. Synthetic chemicals are used to emulate scents that do not occur naturally or are hard to obtain. Alcohol, coal, tars, and petrochemicals are also used during the manufacturing process to create perfume oil.
Oil Extraction
Once the ingredients are gathered, the next step is to extract the scented oils from the natural ingredients. This can be done through various methods, including solvent extraction, steam distillation, expression, enfleurage, maceration, and boiling. Solvent extraction involves placing flowers in large rotating tanks with benzene or petroleum ether to extract the essential oils, leaving a waxy substance containing the oil. Steam distillation involves passing steam through plant materials to turn the oil into gas, which is then cooled and liquefied. Expression is one of the oldest forms of extraction and is commonly used for citrus oils; it involves pressing the plant mechanically or manually to extract the oils.
Blending and Aging
After extracting the oils, perfumers blend them together to create unique fragrances. This involves combining different aromatic compounds in specific proportions to achieve the desired scent. The blended perfume is then typically aged to allow the scents to mature and develop.
Quality Control and Final Adjustments
Before a perfume is released, it undergoes quality control to ensure it meets the desired standards. Perfumers may make final adjustments to the formulation, adding amplifier compounds to enhance certain scents or using fixatives like ambergris or its synthetic alternative, ambroxide, to make the scent last longer.
Standardization and Bottling
Finally, the perfume is standardized to ensure consistency across batches, and it is bottled and packaged for distribution. This process involves strict quality checks to maintain the integrity of the fragrance.
The formulation of perfumes requires a deep understanding of scent combinations and the chemical properties of various ingredients. While modern techniques have enhanced the process, the art of perfumery still draws on ancient methods, showcasing the rich history and complexity of fragrance creation.
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How perfumes are applied
The application of perfume is just as important as the composition of its notes. Perfume is a mixture of fragrant essential oils, aroma compounds, fixatives, and solvents, usually in liquid form. The intensity and longevity of a fragrance depend on the concentration and longevity of the aromatic compounds or perfume oils used.
When applying perfume, hold the bottle about six inches from your skin and spray it onto pulse points, which are areas where blood flows near the skin's surface, such as the wrists, inner elbows, collarbone, and behind the knees. These areas are ideal because the heat from your body will help release the scent. Less is often more when it comes to perfume application, and a few spritzes should be enough to leave a lasting impression.
Avoid rubbing your wrists together after applying perfume, as this can break down the fragrance molecules and alter the course of the scent. Instead, lightly spritz both wrists and let the liquid sink in. If you have any cuts or abrasions on your skin, avoid applying perfume to these areas as the alcohol in the fragrance can be irritating to broken skin.
The environment and outfit you're wearing can also impact how you apply perfume. If you're in a hot climate, avoid applying perfume directly to your body, as sweat and natural oils can destroy the scent. Instead, lightly mist your hair or clothing. Similarly, if you know you'll be in a humid environment, avoid storing your perfume in the bathroom, as this can accelerate its evaporation.
The type of fragrance you're using may also determine how you apply it. For example, a powerful EDT or EDP may only require one spray to the forearm, while an extrait may be dabbed onto the neck in addition to the arms.
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Safety and legislation
The perfume industry is subject to strict regulations that ensure consumer safety and compliance with scented products. Safety standards, legal requirements, and labelling regulations are crucial and vary by country or region. Perfumes are cosmetic products that come into direct contact with the skin, so their safety is essential. Safety standards impose restrictions on ingredients, including allergenic or potentially harmful substances. Manufacturers must comply with regulated lists of permitted ingredients and adhere to specific limits for certain components. Safety and efficacy testing must be conducted to ensure perfumes pose no risk to consumer health.
Legal requirements for the perfume industry include product registration, labelling, ingredient disclosure, good manufacturing practices, and manufacturer liability. Labels must include mandatory statements such as the perfume name, manufacturer's name and address, product volume, complete ingredient list, usage precautions, and batch numbers. Regulations may also require specific warnings for allergenic ingredients or flammable substances. Manufacturers have a legal responsibility to ensure their products are safe and properly labelled.
In 2020, the Fragrance and Flavors Right to Know Act (SB 312) was passed in California. The law requires the disclosure of toxic fragrance and flavour ingredients linked to cancer, reproductive or developmental harm, neurotoxicity, hormone disruption, allergies, and air and water contaminants. This information must be disclosed to the state of California's Safe Cosmetics Program database. The law aims to give consumers the right to know what chemicals are in the fragranced products they use. It also helps manufacturers who want to practice a higher level of transparency and provides regulators with information to regulate cosmetic product safety effectively.
The Federal Fragrance and Flavor Right to Know Act (HR 5538) has also been introduced at the federal level. This act requires the on-pack disclosure of any fragrance or flavour chemicals that appear on designated hazard lists, including EU 26 fragrance allergens. Additionally, the International Fragrance Association (IFRA) provides the fragrance industry with clear guidance to support safe, sustainable product creation and use. IFRA Standards are a globally recognized risk management system for the safe use of fragrance ingredients, developed through continuous scientific review and expert collaboration.
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Frequently asked questions
Perfume is made up of molecules. It is a mixture of fragrant essential oils, aroma compounds, fixatives, solvents and chemicals.
Perfumes have three layers of fragrance, known as the Fragrance Pyramid. The first layer is the top note, which is the first scent you smell. The second layer is the heart note, which lingers longer and is usually a spicy compound. The third layer is the bass note, which is the strongest and lasts the longest.
The different types of perfumes reflect the concentration of aromatic compounds in a solvent. The most common types are Parfum or Extrait, which contain 15-40% aromatic compounds, and Esprit de parfum, which contains 15-30%.
The process of making perfume involves distilling flowers or plants using water vapour to capture their essential oils. Other methods include maceration, which is similar to extraction, and enfleurage. In modern times, perfume is also created in labs using synthesized chemicals and real scent extractions.
Some common chemicals used in perfumes include benzyl alcohol, limonene, ethyl alcohol, kashmirin, acetone, ionones, ethanol, ethyl acetate, and benzaldehyde.
