Anisha Riggs
Perfumes have been around for thousands of years, with the oldest evidence of perfume-making dating back to the Bronze Age. Ancient civilizations like the Egyptians used botanical fragrances as a sign of social status, and today, perfumes are a multi-billion dollar industry. The science behind how perfumes work is fascinating. They are designed with a three-part smell, consisting of top, heart, and base notes that unfold over time after application. The temperature and moisture levels of the skin influence how the fragrance projects, and the heat from our bodies can enhance the intensity of the scent. Perfumes with synthetic pheromones aim to enhance attraction, and the blend of fragrances can be carefully curated to create a unique scent.
| Characteristics | Values |
|---|---|
| How humans perceive scent | Humans have about 50 million scent receptors that work together to collect scent molecules when we inhale and the molecules are absorbed by a thin membrane in the nasal cavity. |
| How perfumes work | Perfumes have three "notes" that unfold over time. The first note is the top note, which produces the immediate impression of the perfume and evaporates quickly. The middle notes emerge just before the top notes dissipate, and the base notes appear while the middle notes are fading. |
| How long perfumes last | Perfumes can be preserved for at least two years if stored at room temperature, in the dark, and in a spray bottle. |
| Factors influencing perfume scent | Skin temperature, moisture levels, and body chemistry can affect how fragrances project off the skin. Low-intensity workouts like walking and yoga can also influence how your perfume smells, as the increase in body temperature can emit scents more intensely. |
| Why people wear perfume | People wear perfume to boost their sense of self-esteem, make themselves feel more desirable, and as a badge of individuality. Perfume can also alter moods and evoke pleasant memories. |
| How perfumes are made | Perfumes are made from natural ingredients such as flowers, grasses, spices, fruit, wood, roots, resins, balsams, leaves, gums, and animal secretions. However, manufacturers are increasingly favoring synthetic chemicals over natural oils to bring down prices and encourage more frequent use. |
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What You'll Learn
- How perfume notes work: Top, heart, and base notes have different evaporation rates, creating a scent that evolves?
- Body chemistry: Skin type, temperature, and oiliness influence how perfume smells and reacts to your body
- Dilution: Alcohol dilutes perfumes, spreading out smells so you can distinguish them
- Scent receptors: Humans have 50 million scent receptors that collect molecules when we inhale
- History: Perfumes date back to the Bronze Age, used by ancient Egyptians as a sign of status
How perfume notes work: Top, heart, and base notes have different evaporation rates, creating a scent that evolves
The art of perfumery involves combining top, heart, and base notes to create a harmonious fragrance. These notes refer to the different layers of scent that evaporate at different rates, working together to create a scent that evolves over time.
Top notes, also known as head notes, are the first layer of a fragrance that you smell immediately after spraying. They are characterised by light, small molecules that evaporate quickly, typically within 5 to 20 minutes. Top notes are often described as fresh, assertive, or sharp and commonly include citrus scents like lemon, orange, and bergamot, as well as light florals like lavender and rose. These notes create the initial impression of a perfume, making them crucial in the selling process.
Heart notes, also referred to as middle or mid notes, emerge as the top notes begin to dissipate. They act as the liaison between the top and base notes, adding depth and intensity to the fragrance. Heart notes typically consist of full-bodied, aromatic floral oils like jasmine, ylang-ylang, and geranium, as well as spices such as cinnamon and pepper. They make up a significant proportion of the overall fragrance, approximately 40-80%, and are considered the "main character" of the perfume.
Base notes, also known as soul notes, are the foundation of the fragrance. They are composed of large, heavy molecules that evaporate slowly, taking about 30 minutes to emerge and lasting for several hours or even days. Base notes are rich and long-lasting, providing depth and solidity to the fragrance. Common base notes include vanilla, amber, musk, and woody notes like sandalwood and cedarwood. They create the final, lasting impression of a perfume, evoking memories and transporting you back in time.
The interplay of these three types of notes creates a symphony of scents that evolve on the skin, with each note contributing to the overall fragrance's development and longevity. The fragrance pyramid, a concept established by perfumer Jean Carles, helps visualise this process, with top notes at the peak, heart notes in the middle, and base notes at the foundation.
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Body chemistry: Skin type, temperature, and oiliness influence how perfume smells and reacts to your body
Body chemistry plays a significant role in how perfume interacts with your skin and its scent. The unique combinations of hormones, oils, and sweat glands in each person's body chemistry cause a fragrance to smell different on everyone, a phenomenon known as "fragrance individuality" or "scent variation."
Skin type is an important factor in how perfume smells and reacts to your body. Dry skin tends to absorb fragrances more, so the scent may not be as intense. On the other hand, well-moisturized skin can better hold onto fragrance molecules, making the perfume last longer. Oily skin can also react differently to certain scents, with sugary notes like vanilla being extra potent and light citrus scents working well. Skin pH levels can also affect how a perfume smells; for example, citrusy top notes may fade faster on more acidic skin.
Body temperature also influences how perfume reacts to your body. Higher body temperatures can cause faster evaporation of scent molecules, leading to a less noticeable fragrance. Additionally, lifestyle choices such as exercise routines and alcohol consumption can impact body temperature and hydration levels, which in turn affect how perfume smells and lasts on the body.
Other factors that influence how perfume interacts with your body include individual hormone levels, sweat production, and the natural skin oils that combine with the oils in perfumes to create a personalized aroma. Understanding how these factors interact with different scents can help maximize the effectiveness and longevity of perfumes.
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Dilution: Alcohol dilutes perfumes, spreading out smells so you can distinguish them
The use of alcohol in perfumes dates back to ancient cultures like Egypt, Mesopotamia, the Indus Valley, and China. Alcohol is a key ingredient in perfumes, serving multiple functions beyond being a mere solvent. It is an excellent carrier in perfumery because of its light and unstable nature, which allows for the gentle lifting and dissemination of fragrance notes.
Alcohol, specifically ethanol or ethyl alcohol, is used to dilute fragrance concentrates, which are made up of raw materials such as flowers, spices, resins, and woods. It acts as a solvent, helping to create a sprayable consistency and aiding in the dispersion of the perfume on the skin. The evaporation of alcohol allows the scent to unfold over time, as the heart and base notes develop.
Diluting perfume materials in alcohol helps with the evaluation of odour profiles and facilitates the evaporation process, providing a fuller profile of the scent. It is important to note that not all alcohols are suitable for perfumes. Methanol, for example, is toxic and should not be used. Instead, cosmetic-grade Trade-Specific Denatured Alcohol (TSDA), specifically SD-40b, is widely used and recommended for perfumery.
Diluting perfume materials before blending makes them easier to work with and allows for the addition of trace amounts of expensive materials, preventing wastage. Alcohol also ensures that the perfume does not leave an oily residue, as oils alone might, and dries quickly on the skin, allowing the fragrance to develop without feeling wet or sticky.
In summary, alcohol plays a crucial role in perfumery by diluting fragrance concentrates, acting as a solvent, aiding evaporation, and enhancing the overall scent development process.
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Scent receptors: Humans have 50 million scent receptors that collect molecules when we inhale
Humans have an incredible sense of smell, with the ability to discern a wide variety of scents. We have about 50 million scent receptors that work together to collect scent molecules when we inhale. These scent receptors are located on the surface of sensory neurons in the nasal cavity.
The process of scent detection begins when an odour binds to a receptor within the nasal cavity, transmitting a signal through the olfactory system. Small hair-like protrusions in the nose, called cilia, then send the appropriate signals to one of the four areas of the brain that process and manage olfactory inputs. The frontal cortex of the brain is responsible for the perception of the scent, while the amygdala and hypothalamus are responsible for the physical and emotional responses we have to certain smells.
The human olfactory system has hundreds of different olfactory receptors, allowing us to discriminate between a vast number of different scents. According to an analysis of data from the Human Genome Project, humans have approximately 400 functional genes coding for olfactory receptors, with the remaining 600 candidates being pseudogenes. Each olfactory receptor neuron expresses only one functional odour receptor, and they function like a key-lock system. If the airborne molecules of a certain chemical fit the receptor, the nerve cell will respond.
The sense of smell has biological significance for mate selection and reproductive success. Adorning artificial scents, such as perfumes, can increase mate attraction through various mechanisms, such as boosting self-confidence or seducing a biologically incompatible mate. Perfumes are designed with a three-part smell that unfolds after application, with top, heart, and base notes that evaporate at different rates, creating a unique and lasting fragrance.
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History: Perfumes date back to the Bronze Age, used by ancient Egyptians as a sign of status
The history of perfumes is a long and fascinating one, dating back to the ancient world. The oldest evidence of perfume-making suggests that it originated in the Bronze Age, nearly 4,000 years ago. Ancient civilisations such as the Egyptians and Mesopotamians were creating perfumes as early as 3000 BC.
The ancient Egyptians were not only concerned with the scent of perfumes but also viewed them as a sign of social status. Indeed, perfumes were a major export material, with various countries vying to produce the highest-quality fragrances. The competitive nature of the perfume trade meant that some form of uniformity and standardisation was expected. The ancient Egyptians distilled botanical fragrances such as attar and lily, and also used incense, which was considered the "Fragrance of the Gods". Creating incense was a way to connect with the divine and please the deities.
The first perfumers were Egyptian priests, who used aromatic resins to sweeten the smell of sacrificial offerings. They also used perfumes to scent the temples, burning different scents at different times of the day: frankincense in the morning, myrrh during the day, and Kyphi in the evening. Kyphi was a special type of incense that was made from expensive resins imported from other countries, honey, spices, roots, and wine. The process of making Kyphi was meticulous and lengthy, sometimes taking up to six months and involving magic formulas and spells.
Perfume-making was considered an art form, and the craftsperson was regarded as an artist. The profession was open to both men and women, and the act of creating perfumes was a meticulous process. Reliefs on the walls of tombs in Petosiris show that perfume-making had an overseer, workers who completed the extraction, and a professional tester who rigorously tested the perfume using their sense of smell. The reliefs also pictorially detail two extraction processes, one of which was an ancient mechanical extraction similar to wine production.
The ancient Egyptians used a variety of ingredients in their perfumes, many of which are still used and prized in perfumery today. These included henna, cinnamon, iris, bitter almond, lilies, myrrh, frankincense, benzoin, honey, musk, and various imported aromatics such as ladanum from Arabia and East Africa, and galbanum from Persia.
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Frequently asked questions
Perfumes are made up of essential oils derived from natural aromatic plant extracts and/or synthetic aromatic chemicals. When you spritz a perfume, about 50 million scent receptors in your nose work together to collect the scent molecules, which are then absorbed by a thin membrane in the nasal cavity.
Personal chemistry plays a big role in how a perfume smells on you. Your skin type and texture can influence how a perfume reacts to your body. For instance, perfume may not smell as intense on dry skin. Your workout regimen can also influence how fragrances last on your body and what they smell like. Trial and error is the best way to find your perfect match.
Most perfumes are engineered to have a three-part smell, which unfolds after you apply it. Top notes consist of small molecules that evaporate quickly and can be smelled within the first 15 minutes of applying. Heart notes appear after about 3 to 4 hours and are what you probably remember about the perfume. Base notes are large molecules that evaporate slowly and can be detected 5 to 8 hours after application.
