Perfume degrades through three pathways: UV light destabilizes fragile aromatic molecules, heat accelerates oxidation, and humidity can compromise label integrity and atomizer components. A closed drawer in a bedroom satisfies the three constraints better than any other common household location, and is what the industry recommends for long-term storage (Perfumer & Flavorist, accessed 2026-05-29).
No perfume is genuinely allergen-free for all individuals. Any aromatic compound, natural or synthetic, can sensitize a susceptible immune system. The biological mechanism (small molecules acting as haptens that bind to skin proteins and provoke T-cell responses) is not limited to a finite list of known compounds, and new sensitizations are documented in the dermatological literature each year (RIFM, accessed 2026-05-29).
Fragrance compounds do enter the bloodstream in measurable amounts. Once an aromatic molecule crosses the stratum corneum into the dermis, the dermal capillary network can take it into systemic circulation. This is not theoretical: biomonitoring studies have detected specific fragrance compounds in blood serum, adipose tissue, and breast milk across European and North American populations (RIFM, accessed 2026-05-29).
Fragrance compounds penetrate the skin. The stratum corneum (the outermost layer of dead, keratinized cells embedded in a lipid matrix) is the main barrier. Molecules below 500 Daltons in molecular weight that are also lipophilic cross this matrix most readily, and most fragrance materials fit that profile. Linalool (154 Da), limonene (136 Da), eugenol (164 Da), and many synthetic musks (200 to 300 Da) all show measurable dermal absorption in standard in vitro and in vivo assays (RIFM, accessed 2026-05-29).
Citrus character in perfumery comes from a family of monoterpene molecules: limonene (principal in all citrus), linalool, linalyl acetate, citral, and minor terpene alcohols and esters that differ by source material. These molecules share a structural vulnerability: unsaturated carbon-carbon double bonds that are highly reactive with oxygen at room temperature (Perfumer & Flavorist, accessed 2026-05-29).
Musks are among the most chemically stable raw materials in perfumery. Where citrus terpenes oxidize within months and aldehydes can develop rancid facets within a few years, polycyclic and macrocyclic musks resist degradation over decades at room temperature. This stability is structural: their saturated polycyclic or large-ring frameworks lack the reactive double bonds that drive autoxidation in lighter notes (Perfumer & Flavorist, accessed 2026-05-29).
Woody notes are among the most stable fragrance materials, second only to musks in archival robustness. The defining molecules (santalols in sandalwood, cedrol and alpha-cedrene in cedarwood, vetiverol and khusimol in vetiver, guaiacol in guaiac, and synthetic anchors such as Iso E Super and Cashmeran) are mostly saturated sesquiterpenes or polycyclic structures with few reactive double bonds (Perfumer & Flavorist, accessed 2026-05-29).
Once a bottle is opened, oxygen begins to interact with the fragrance compounds inside. Autoxidation gradually alters the character of the formula, and the rate of change depends on the chemistry of the dominant molecules. Most fragrances remain wearable for one to three years after opening under average conditions, and for three to five years or more under careful storage in a cool, dark, upright bottle (Perfumer & Flavorist, accessed 2026-05-29).
A sealed perfume bottle has almost no air headspace, which removes the dominant driver of autoxidation. This is why unopened bottles age more slowly than opened ones. Under good storage (dark, cool, stable, low humidity), a sealed niche fragrance can remain in excellent condition for 10 to 30 years, and certain stable compositions for much longer (Perfumer & Flavorist, accessed 2026-05-29).
The practical answer is two. Two complete fragrances can be layered on the same surface and still produce a result in which both compositions remain perceptually distinct. A third sprayed composition typically collapses the distinction between layers, producing a single dense accord in which the wearer can no longer identify the contributions of the individual fragrances (Bois de Jasmin, accessed 2026-05-29).
The cabin rule combines two conditions applied at the same checkpoint. Each individual container must hold 100 ml (3.4 oz) or less, and every liquid you carry must fit inside one transparent, resealable bag of one liter or less. Both conditions are checked, and either failure stops the bottle. A 100 ml format only passes if it physically fits in the bag alongside toothpaste, sunscreen, and any other liquids you carry (European Commission, EC Regulation 300/2008 on civil aviation security).
A failed layering announces itself in the first twenty minutes: the pairing reads as muddy, flat, or simply loud. The diagnosis is almost always the same short list of structural errors rather than a fundamental incompatibility between the two fragrances. Each error has a documented countermeasure rooted in the technical literature of olfactive composition (Perfumer & Flavorist, accessed 2026-05-29).
Musk and floral is the layering combination with the highest tolerance for error. Synthetic white musks have anchored modern perfumery since the 1970s precisely because they extend other compositions without imposing a distinctive olfactive identity of their own. Applied as a base layer, white musk provides warmth, longevity, and a soft halo that allows almost any floral applied on top to read clearly and develop its full arc (Perfumer & Flavorist, accessed 2026-05-29).
Oud and citrus is one of the oldest documented layering accords in perfumery, rooted in Gulf practice and adopted widely by Western niche houses since the early 2000s. The structural logic is clear: oud anchors the skin with very low volatility and persistent woody-resinous facets; citrus provides a volatile, bright counterpoint that would normally fade within the hour but is extended by the oud reservoir underneath (Perfumer & Flavorist, accessed 2026-05-29).
Decanting transfers perfume from the original bottle into a smaller travel format. The standard for niche carry-on travel sits at 10 ml (0.34 oz), well under the 100 ml cabin liquids ceiling and large enough for a week of wear at three sprays per day. The objective is twofold: stay within International Civil Aviation Organization cabin rules and protect a valuable original bottle from the temperature, pressure, and impact stress of travel (Perfumer & Flavorist, accessed 2026-05-29).
Successful layering is a controlled application of physical chemistry. Every fragrance molecule has its own vapor pressure, which determines how fast it evaporates from skin. Citrus and green top notes leave within thirty to sixty minutes, heart notes persist two to four hours, base materials such as musk, sandalwood, amber, and oud anchor for many hours. Layering manually reconstructs the volatility hierarchy that a single composition builds internally through its pyramid structure (Perfumer & Flavorist, accessed 2026-05-29).
Glass perfume bottles are designed for visual elegance and tactile presence, not for the rough handling of airport baggage systems. Protecting them in transit requires a deliberate four-step approach: individual wrapping, pump locking, central placement inside the bag, and containment inside a sealed plastic pouch in case of leakage. Each step addresses a different physical risk, and all four together produce the safe transport that any single step alone cannot guarantee (IATA Dangerous Goods Regulations, 65th edition, 2024).
Long-term perfume storage hinges on four environmental variables: light, temperature, humidity, and air exposure. Each accelerates the chemical degradation of fragrance molecules in distinct ways, and the effects compound. A bottle stored poorly across two variables deteriorates significantly faster than one stored poorly across only one. Under good conditions, an unopened eau de parfum holds its character for five to seven years; under poor conditions, the same composition can shift detectably in three to six months (Perfumer & Flavorist, accessed 2026-05-29).
Identifying an aged fragrance combines two independent assessments: visual and olfactive. Neither is sufficient alone. Some formulas darken visibly without much shift in scent. Others lose their top notes long before any change in liquid color. A reliable diagnosis requires both checks, performed in good light and on clean, dry skin (Perfumer & Flavorist, accessed 2026-05-29).
The reliable home test for sensitive skin is simple in structure but requires patience. Apply a single spray or a small drop from a sample vial to the inner forearm, leave it on the skin for at least four hours without washing, then observe the site for 48 hours. Contact allergy reactions are classified as type IV hypersensitivity, which means they develop 12 to 72 hours after the allergen reaches the skin, not within minutes (European Society of Contact Dermatitis, Guidelines on contact dermatitis, accessed 2026-05-29).
Air travel with perfume sits at the intersection of two unrelated systems: aviation security rules that govern what enters the cabin, and the physical chemistry of fragrance behaviour under temperature and pressure cycling. The cabin rule is firm and globally aligned: each individual liquid container in carry-on baggage must hold 100 ml (3.4 oz) or less, and all such containers must fit into a single transparent resealable bag with a maximum capacity of one liter. The rule applies at airports in the European Union, the United States, the United Kingdom, Canada, Australia and the vast majority of countries that align on ICAO standards (Transportation Security Administration, accessed 2026-05-29).
Perfume use during pregnancy sits at the intersection of precautionary toxicology, practical well-being, and the absence of definitive evidence. Current regulatory and medical consensus does not establish normal commercial perfume use as a proven health risk in pregnancy. The European Cosmetics Regulation (EC) 1223/2009 governs the safety of fragranced products on the EU market, and the IFRA Standards set quantitative limits on individual fragrance materials. Together they constrain the ingredients and concentrations a pregnant woman is realistically exposed to through commercial perfume (International Fragrance Association, IFRA Standards, 51st amendment, 2024).
In Gulf countries and across the broader Arab world, fragrance is rarely applied from a single bottle. Traditional practice combines several aromatic elements in a deliberate sequence, each diffused through a different medium. The result is a layered fragrance environment that surrounds the wearer rather than simply emanating from pulse points, and the practice has been continuous for centuries before Western niche perfumery formalized the term "layering" (Perfumer & Flavorist, accessed 2026-05-29).
Refrigeration of perfume has sound physical-chemistry logic behind it. Chemical reaction rates, including the oxidation that flattens aldehydes and terpenes, slow approximately by half for every 10 °C (18 °F) reduction in temperature. A fragrance kept at 12 °C (54 °F) oxidizes at roughly half the rate of the same fragrance kept at the typical room temperature of 22 °C. Over one or two years of storage this difference is measurable, particularly for compositions rich in citrus and green opening notes (Perfumer & Flavorist, accessed 2026-05-29).
Fragrance allergy presents most often as allergic contact dermatitis at or near the application site. The cluster includes redness, itching, a rash with fine bumps (papules) and sometimes small fluid-filled blisters (vesicles). The neck, wrists, inner elbows and the area behind the ears are the most common locations, corresponding to the traditional pulse points. The diagnostic feature is timing: the reaction is delayed, typically appearing 12 to 48 hours after application and peaking at 48 to 72 hours (Contact Dermatitis, peer-reviewed journal, accessed 2026-05-29).
"Clean beauty" has become one of the most used and least defined terms in contemporary fragrance marketing. It typically describes a product formulated without a self-selected list of ingredients the brand considers controversial: certain synthetic musks, phthalates, parabens, oakmoss extracts, specific furocoumarins or other materials flagged by advocacy groups such as the Environmental Working Group. The exclusion list differs from one brand to the next.
A cruelty-free perfume is one whose development and production involved no animal testing at any stage: not of the finished fragrance, not of the individual ingredients, and not by any third-party supplier in the formulation chain. Unlike "clean beauty", the underlying concept has a defined regulatory referent in the European Union, but the specific phrase "cruelty-free" itself has no harmonized legal definition and depends on the issuing certification body for its precise meaning.
A glass perfume atomizer is a refillable spray container made from glass, used to carry or store a decant of perfume. It pairs a small glass body, typically 5 to 30 ml (0.17 to 1.0 oz), with a pump mechanism that delivers a fine spray. The category covers everything from inexpensive sample-sharing vials to precision-machined luxury objects sold as collectible objects in their own right by niche perfumery boutiques (Perfumer & Flavorist, accessed 2026-05-29).
"Hypoallergenic", from the Greek hypo (less) and allergenic, means formulated to be less likely to cause allergic reactions. Applied to perfume, it signals that the brand has taken steps to reduce the allergen load of the formula, typically by avoiding fragrance compounds most commonly associated with contact sensitization. The direction is useful for sensitive-skin consumers, but the term has a critical limitation: it is not standardized by any major cosmetics regulator (European Commission, Regulation (EC) 1223/2009, accessed 2026-05-29).
A scented body cream used in layering is a fragrant emollient applied to the skin before a spray perfume, functioning as a base layer in the composition rather than as a neutral skincare product. The cream serves two distinct purposes at once. Physically, it provides an emollient film that slows the evaporation of the spray fragrance applied on top, extending longevity by roughly one to three hours under typical conditions (Perfumer & Flavorist, accessed 2026-05-29).
A scented deodorant is rarely a neutral hygiene product. It deposits perfume-grade fragrance in one of the warmest, most diffusive zones of the body and persists for six to ten hours on average, which means any spray perfume worn over it operates as the second layer in an unplanned combination. The result is not the published composition of either product, but a hybrid the wearer never selected (Perfumer & Flavorist, accessed 2026-05-29).
A single-source product is a body oil, cream, hair mist, or shower gel signed by the same perfumer or composed under the same olfactive direction as a spray perfume in the maison's catalog. It is sold as part of a coherent set rather than as a generic toiletry, and its purpose is to extend the wearing window of the perfume while preserving its signature (Fragrantica editorial archive, accessed 2026-05-29).
A skin allergy to perfume is a delayed type IV hypersensitivity reaction in which the immune system identifies a specific fragrance material as a threat and triggers contact dermatitis on repeated exposure. The European Union currently requires labelling of 82 fragrance allergens under the 7th amendment to the Cosmetics Regulation, up from 26 since 2023, which reflects the scale of identified sensitisers in modern formulations (European Commission, Cosmetics Regulation 1223/2009 amended, 2023).
A sport perfume is a marketing label rather than a regulatory category. It typically covers light, fresh, predominantly synthetic compositions in eau de toilette concentration of 5 to 12 percent fragrance oil, structured around citrus, aromatic herbs, marine notes, and clean musks. The intent is to remain readable on skin warmed by physical effort without becoming oppressive (Perfumer & Flavorist, accessed 2026-05-29).
A vegan perfume is a composition that excludes every ingredient of animal origin, both in the fragrance formula and in the wider product including the alcohol, the colourants, and any auxiliary materials. The label generally implies that the finished product has not been tested on animals, although the cruelty-free claim is a separate one and rests on different evidence.
An alcohol-free perfume replaces the ethanol that carries most modern fragrances with an alternative solvent, typically a vegetable oil, a glycol, a water-based emulsion, or a wax matrix. The substitution changes everything downstream: projection, longevity, the temperature and behavior on skin, and the wearing context the perfume is designed for (Perfumer & Flavorist, accessed 2026-05-29).
An aluminum perfume atomizer is a small refillable spray bottle, typically 5 to 15 ml (0.17 to 0.5 fl oz) in capacity, made of anodised aluminum with an internal glass or stainless steel reservoir and a fine-mist pump. It is designed for travel, daily portability, and the controlled decanting of fragrances from full-size bottles into a smaller, more discreet format.
An olfactive clash occurs when two or more fragrance materials, worn together or formulated together, fail to integrate into a coherent whole. The result is a dissonant impression: muddy, aggressive, sharp, or simply confused. The clash is a perceptual phenomenon as much as a chemical one, and trained perfumers spend years learning to recognise and prevent it (Perfumer & Flavorist, accessed 2026-05-29).
Bakhoor (also spelled bukhoor) is a traditional incense from the Arabian Peninsula, made of perfumed wood chips, typically agarwood (oud) shavings soaked in aromatic oils, resins, and floral absolutes, then dried and burned slowly on hot charcoal or an electric mabkhara. The smoke perfumes the air, the body, the hair, and clothing as a foundation layer that holds for many hours before any spray perfume is applied (Amouage cultural archive, accessed 2026-05-29).
Bergapten-free bergamot is the essential oil of Citrus bergamia from which the furocoumarin bergapten (5-methoxypsoralen) has been removed by physical or chemical refining. The treatment makes the oil safe for use in leave-on perfumery without restrictions related to skin photosensitisation. Untreated bergamot is one of the most photosensitising raw materials in the natural perfumer's palette and is sharply restricted under IFRA Standards (IFRA, Standard on furocoumarins, 51st amendment, 2024).
Contact dermatitis is the clinical term for skin inflammation caused by direct contact with a substance. Applied to perfume, it covers two mechanistically distinct conditions that share similar symptoms: allergic contact dermatitis (ACD) and irritant contact dermatitis (ICD). Both produce redness, itching, and rash at the application site, but they differ in mechanism, who is affected, at what doses, and after what exposure history. This entry is informational; anyone with a suspected reaction should consult a healthcare professional.
Perfume layering is the practice of applying two or more fragrances to the skin, either simultaneously or in sequence, so that they merge into a single olfactive result. The goal is a personalized signature that no single bottle could produce on its own. Layering exists at every level of the market, from 50 € (55 USD) drugstore mists combined for fun to four-figure attars and oud oils stacked by Gulf wearers in deliberate sequences refined over generations (Fragrantica, accessed 2026-05-29).
Oxidation is the chemical reaction between molecules and oxygen. In fragrance, it refers to reactions between aromatic compounds and the oxygen present both in the air space above the liquid inside a bottle and in the environment through which the perfume diffuses after application. The reaction produces new compounds with different olfactive properties, which is why an old bottle smells noticeably different from a freshly opened one (Perfumer & Flavorist, accessed 2026-05-29).
Perfume photosensitization is a skin reaction triggered when certain aromatic compounds applied to skin absorb ultraviolet radiation and undergo a photochemical reaction that injures the upper skin layers. The most recognizable outcome is the formation of hyperpigmented patches on areas where fragrance was applied and subsequently exposed to sunlight, a condition historically called berloque dermatitis. Reactions typically appear several hours after exposure and manifest as pigment changes rather than acute redness or pain (DermNet, accessed 2026-05-29). This is not a substitute for medical advice; anyone with a suspected reaction should consult a healthcare professional.
The phrase "26 allergens" refers to the list of fragrance substances first required on cosmetic product labels in the European Union under the 7th Amendment to the Cosmetics Directive, namely Directive 2003/15/EC. These compounds were identified as known contact allergens or sensitizers by the Scientific Committee on Consumer Safety and included both natural components such as oakmoss and tree moss and synthetic molecules such as isoeugenol, cinnamal, and coumarin. They must be declared by their INCI name whenever present above 0.001 percent in leave-on products such as perfume and 0.01 percent in rinse-off products (European Commission, accessed 2026-05-29).
In Gulf countries and across the Arab world, fragrance is rarely applied from a single bottle. Traditional practice combines multiple aromatic elements in a deliberate sequence, each delivered through a different medium. The result is a layered fragrance environment, closer to how a room smells than how a person smells, yet intimately tied to the wearer. The custom predates contemporary Western alcoholic perfumery by several centuries and remains the dominant mode of fragrance use from Riyadh to Muscat (Basenotes, accessed 2026-05-29).
The base layer in a perfume combination carries two responsibilities. It must persist on skin for the duration of the wear arc, and it must provide a supportive platform that enhances rather than competes with the fragrance applied on top. Both requirements narrow the field of candidates to materials with low molecular volatility and a relatively neutral or warm character. Compositions known for this role include Maison Francis Kurkdjian's Aqua Universalis as a clean musk-led ground, Diptyque's Eau Duelle as a soft vanilla ground, and Le Labo's Another 13 as an ambroxan-led ground (Fragrantica, accessed 2026-05-29).
Wearing fragrance while exercising is less about personal preference than about shared space. Gyms, fitness studios, and indoor courts are enclosed environments where projection amplifies quickly and ventilation is often limited. Skin temperature can climb from a resting 32 °C (90 °F) to 35 °C (95 °F) or more during effort, which dramatically increases sillage. Two sprays that read as discreet at home can become overpowering after twenty minutes on a treadmill (Perfumer & Flavorist, accessed 2026-05-29).
This entry is informational and does not replace medical advice. Parents and caregivers with specific concerns should consult a pediatrician or pediatric dermatologist. Infants are biologically distinct from adults in ways that make them more vulnerable to fragrance exposure. The stratum corneum is thinner, transepidermal water loss is higher, the metabolic enzyme systems are not fully active, and the immune system is still developing. The same molecule applied to an infant therefore penetrates more, persists longer, and reaches a higher per-kilogram dose than in an adult (American Academy of Dermatology, accessed 2026-05-29).
This entry is informational and does not replace medical advice. Anyone experiencing a significant or persistent reaction should consult a healthcare professional. When a perfume reaction occurs, the first priority is to remove the trigger. Wash the affected skin promptly with mild soap and lukewarm water; avoid hot water, which dilates blood vessels and can increase the absorption of any remaining fragrance compounds. Avoid scrubbing, which adds mechanical irritation to chemical irritation. A gentle wash and a careful pat-dry remove most surface residue (DermNet, accessed 2026-05-29).
Sensitive skin and niche perfumery are not incompatible, but selection has to be deliberate. Niche compositions usually carry higher concentrations of aromatic materials than mass-market eaux de toilette, and the traditions that define the segment, chypre, oriental, rich floral, lean on ingredient families that the EU Cosmetics Regulation 1223/2009 flags most often. The 7th amendment, effective 2023, raised the number of fragrance allergens that must be individually declared on packaging from 26 to 81, which makes ingredient screening more transparent than it has ever been (RIFM, accessed 2026-05-29).
Layering two fragrances follows a structural logic close to musical counterpoint: the two voices must occupy different registers and share a common harmonic ground. In olfactive terms, that means one composition acts as a slow-diffusing base while the other contributes a faster, more vertical character. The fragrance wheel developed by Michael Edwards in Fragrances of the World organizes families by perceptual proximity, and families that sit adjacent on the wheel share enough dominant molecules to combine without producing a dissonance (Fragrances of the World, Edwards classification, accessed 2026-05-29).
Decades of patch-test surveillance have produced a stable hierarchy of fragrance allergens. The compounds most frequently positive in European patch-test populations are oakmoss-derived atranol and chloroatranol, isoeugenol, cinnamal (cinnamaldehyde), geraniol, and hydroxycitronellal. These appear consistently across the ESSCA (European Surveillance System on Contact Allergy) and the NACDG (North American Contact Dermatitis Group) datasets that the EU Scientific Committee on Consumer Safety relies on when setting allergen policy (SCCS Opinion on Fragrance Allergens, 2012 and 2023 updates).
The phenomenon known as sun stains results from a defined photochemical reaction between bergapten, a furanocoumarin naturally present in cold-pressed bergamot oil, and UVA radiation. Bergapten belongs to the psoralen family, flat aromatic molecules with strong affinity for DNA intercalation. When bergapten is on skin and the skin is then exposed to UVA, the molecule inserts between DNA base pairs and the UVA energy drives a covalent crosslinking reaction. The resulting DNA damage triggers an inflammatory and melanogenic response in which melanocytes overproduce melanin at the application site (Perfumer & Flavorist, accessed 2026-05-29).
Fragrance aging is usually discussed as degradation, but under the right conditions a fragrance can transform in ways many wearers prefer to the original. The decisive variable is the speed of chemical change. Fast change driven by heat, light, or oxygen produces oxidation, polymerization byproducts, and off-notes that flatten the composition. Slow, controlled change over years under low light and stable temperature can produce a deeper, rounder reading of the same formula (Perfumer & Flavorist, accessed 2026-05-29).
A fragrance turns when oxidation, photochemistry, or thermal stress alter its molecular composition faster than the wearer expected. The single most predictive variable is the monoterpene content of the formula. Limonene, linalool, geraniol, citronellol, and similar unsaturated terpenes carry double bonds that react readily with atmospheric oxygen to form hydroperoxides, aldehydes, and ketones with off-note character. A composition built principally on these molecules can show measurable olfactive change within months under typical home storage (Perfumer & Flavorist, accessed 2026-05-29).
Foam in a perfume atomizer is a temporary suspension of air bubbles in an alcohol-rich liquid. The primary driver is the low surface tension of ethanol, the principal carrier in fine fragrance. Water sits at roughly 72 mN/m at 20 degrees Celsius (68 degrees Fahrenheit), while ethanol sits at about 22 mN/m, which means bubbles introduced by pump turbulence escape much more slowly through an ethanol-rich juice than they would through water. Most cases dissipate within one to five minutes and leave the fragrance chemically unchanged (Perfumer & Flavorist, accessed 2026-05-29).
Heat accelerates every chemical reaction in a fragrance, including the oxidation and polymerization pathways that drive aging. The relationship follows Arrhenius kinetics, the same physical law that governs reaction rates across organic chemistry. As a practical rule of thumb, every 10 degree Celsius (18 degree Fahrenheit) rise in temperature roughly doubles the rate of chemical change in the juice. A bottle stored at 30 degrees Celsius (86 degrees Fahrenheit) ages roughly four times faster than the same bottle stored at 10 degrees Celsius (50 degrees Fahrenheit) (Perfumer & Flavorist, accessed 2026-05-29).
Ultraviolet radiation degrades fragrance through photolysis, the direct breaking of chemical bonds by absorbed light energy. The process is distinct from oxidation (which requires oxygen) and from thermal aging (which requires heat). UV acts independently of those two pathways and can degrade a fragrance even in a perfectly sealed, cool bottle if the bottle sits in light. Of the three principal aging vectors, UV is generally the fastest-acting at typical household exposure levels (Perfumer & Flavorist, accessed 2026-05-29).
The chemical names printed in small type on perfume packaging in the European Union are not marketing information. They are legally required allergen disclosures under EU Cosmetics Regulation 1223/2009. The regulation flows from the European Scientific Committee on Consumer Safety (SCCS) finding that certain aromatic compounds are documented contact allergens capable of triggering allergic contact dermatitis or sensitization in susceptible individuals (SCCS Opinion on Fragrance Allergens, 2012 and 2023 updates).