Sulfurol

✦ Synthetic aroma chemical from the thiophene family with an intensely roasted, coffee-like, and sulfurous odor character
✦ Trace-use ingredient — highly effective at concentrations as low as 0.001 percent; a little goes an extremely long way
✦ Adds dark naturalistic depth to leather, tobacco, oud, smoky, and oriental fragrance accords
✦ Exceptionally low odor threshold makes it one of the most potent modifiers available to the DIY perfumer
✦ Vegan and cruelty-free synthetic material with no animal-derived components
✦ Used in fine fragrance, attar blending, incense, candles, and food flavoring applications worldwide
✦ Rabibazaar supplies this as a professional aroma chemical for serious formulators requiring sulfurous trace modifiers

Sulfurol, known chemically as 2-Acetyl Thiophene, is a synthetic aroma chemical belonging to the thiophene family of sulfur-containing aromatic compounds. It was identified and characterized in the mid-twentieth century and has since found use in both the fragrance and food flavor industries. Its roasted, coffee-like, and sulfurous odor profile immediately attracted perfumers seeking trace-level modifiers capable of adding dark, naturalistic texture to compositions that conventional aroma chemicals could not achieve. Small but detectable quantities of 2-acetyl thiophene occur naturally in roasted coffee, cooked meat, and certain fermented materials, which underpins its convincing naturalistic effect in blends.

What makes sulfurol particularly valuable is its extraordinary olfactory potency. With an odor threshold measured in the parts per billion range, it produces significant sensory impact at concentrations far below what most aroma chemicals require. This extreme efficiency means that sulfurol does not simply add a note to a fragrance — it recontextualizes the entire composition, lending a smoldering, roasted dimension to leather bases, deepening the authenticity of oud and tobacco accords, and adding a subtle gaseous-mineral edge to incense and resinous compositions. Skilled perfumers use it as a finishing material, added last in micro-doses to achieve a precise degree of dark complexity.

Rabibazaar supplies cosmetic-grade Sulfurol suitable for DIY perfumers, attar blenders, fragrance students, and professional formulators who are ready to explore sulfurous and smoky trace materials in their creative work.

SCENT DESCRIPTION : Sulfurol opens with a sharp, almost gaseous sulfurous impact that quickly resolves into a rich, roasted character strongly reminiscent of freshly brewed dark espresso and toasted sesame. Beneath the initial chemical edge lies a warm, dry smokiness that evokes charred wood, cured tobacco, and spent matchsticks. At trace dilution, the harsh sulfurous intensity softens considerably, leaving behind a compelling roasted-organic depth that adds convincing naturalness to any composition it inhabits. Its diffusive quality means the olfactory impression extends far beyond what the concentration alone would suggest.

NOTE POSITION : Mid-Base

FRAGRANCE FAMILY : Smoky / Leathery / Tobacco

FACETS : Sulfurous · Roasted · Coffee · Smoky · Tobacco

TENACITY : High — 6 to 10 hours on a blotter at trace concentrations

SILLAGE : High — Projects strongly even at micro-concentrations due to extremely low odor threshold; handle accordingly

Chemical Name : 1-(Thiophen-2-yl)ethan-1-one
CAS Number : 88-15-3
Synonyms : 2-Acetylthiophene, Methyl 2-Thienyl Ketone, Ketone Thienyl Methyl, Acetyl Thiophene
Purity % : 98% minimum (verify with supplier)
Appearance : Pale yellow to colorless liquid
Odor Threshold : 0.002 to 0.01 ppm (verify with supplier)
Solubility : Slightly soluble in water; freely miscible with ethanol, DPG, and carrier oils
Specific Gravity : 1.160 to 1.170 at 25°C (verify with supplier)
Flash Point : Approximately 84 to 88°C (verify with supplier)
Type : Synthetic

Use 0.05–0.5% in warm bases for caramelized nutty depth and smoky animalic elegance. Great in fall/winter perfumes and heavy attars.Fine Fragrance ★★★★★
Sulfurol is primarily a fine fragrance trace modifier with no practical substitute for what it does at micro-dose levels. It is used in leather, tobacco, oud, and smoky oriental accords to add roasted depth and an almost lived-in naturalness that polish alone cannot create. Even at 0.001 to 0.05 percent, it measurably shifts the olfactory texture and authenticity of a composition.

Attar and Oriental Blending ★★★★★
In attar and oriental work, sulfurol pairs exceptionally with oud, vetiver, tobacco, and heavy spice bases. It enhances the dark, complex character of oud attars and contributes a smoldering, animalic quality to musky or resinous compositions. A controlled trace addition to any oud-based accord deepens its realistic, organic character in ways that are immediately noticeable to trained evaluators.

Functional Fragrance ★★★
In functional fragrances such as room sprays or incense blends, sulfurol contributes a convincing smoky and roasted atmospheric quality. Dosing must be extremely precise due to its potency. It is less suitable for personal care functional fragrances where clean or fresh odor profiles are required by the end product category.

Cosmetics ★★
Sulfurol has limited cosmetic application due to its sulfurous character and high olfactory intensity, which can overpower cosmetic base odors at even small overdoses. In rare instances it may appear within sophisticated niche cosmetic fragrances. Thorough stability and consumer acceptance testing is strongly recommended before any leave-on cosmetic application.

Home Fragrance ★★★★
Sulfurol performs well in incense sticks, diffuser blends, and candles where its roasted and smoky character complements woods, resins, and tobacco-type materials naturally. It adds a convincing campfire or smoldering quality to home fragrance compositions that synthetic smoke materials alone cannot replicate. Careful concentration management is required for balanced, non-offensive results.

USAGE RATES TABLE

EDP : 0.001 to 0.05%
EDT : 0.001 to 0.03%
Body Lotion : 0.001 to 0.02%
Shampoo/Body Wash : 0.001 to 0.01%
Candle : 0.005 to 0.10%
Reed Diffuser : 0.010 to 0.20%
Soap : 0.001 to 0.02%

⚠️ These are working concentration guidelines only. Sulfurol is an extremely potent material. Always begin at the absolute lowest suggested concentration and evaluate olfactory impact carefully before any incremental increase. Over-dosing is essentially irreversible in a finished blend.

IFRA 51ST AMENDMENT STATUS

Sulfurol (2-Acetyl Thiophene, CAS 88-15-3) does not appear as a restricted or prohibited material under the IFRA 51st Amendment at the time of writing. As a sulfur-containing synthetic, it should nonetheless be used responsibly and within established safe working concentrations for each application category.

⚠️ Always verify current IFRA status at ifrafragrance.org before formulating. Regulatory classifications are subject to revision. Consultation with your raw material supplier regarding the latest safety data is recommended.

USAGE METHOD 1 — DILUTE BEFORE USE
Always pre-dilute sulfurol to a 1 to 10 percent solution in dipropylene glycol, isopropyl myristate, or perfumer's alcohol before incorporating it into any formula. Working from a diluted stock prevents accidental over-addition, which is the most common and most costly mistake when using ultra-potent trace materials. Label and date all dilutions clearly.

USAGE METHOD 2 — TRACE MODIFIER TECHNIQUE
Add sulfurol as a final-stage modifier after the core accord is otherwise complete and evaluated. Add drop by drop from your pre-diluted stock using a micro-pipette or calibrated dropper, evaluating on a blotter after each addition with a 30-minute wait time. This technique gives precise control over the degree of roasted or sulfurous depth and prevents crossing the threshold from enhancing to dominating.

USAGE METHOD 3 — SMOKE AND INCENSE ACCORDS
For incense or campfire-type compositions, combine sulfurol with birch tar, cashmeran, or smoky vetiver in the base layer to build a convincing multi-dimensional smoldering character. The sulfurous roasted quality of sulfurol and the phenolic smokiness of birch tar create a synergistic smoke accord far more realistic than either material achieves alone.

BEST PAIRINGS

Oud / Agarwood Oil → Deepens naturalness; adds authentic roasted and resinous complexity
Vetiver (Haiti) → Creates dark, smoldering, earthy leather-smoke combination
Tobacco Absolute → Amplifies cured tobacco character; contributes burnt, roasted facets
Birch Tar → Intensifies smoky and leathery character; use both at trace levels only
Iso E Super → Woody-mineral framework anchors and softens the sulfurous note effectively
Cashmeran → Warm, smoky-woody character softens harshness and rounds out the blend
Dark Musks (Exaltolide, Habanolide) → Bridge sulfurous character into wearable animalic base
Labdanum Absolute → Rich amber warmth tames the sulfurous edge; highly compatible base pairing

AVOID

Avoid combining sulfurol with fresh citrus, aquatic, or light clean floral accords without very careful concentration control. The sulfurous character can clash harshly with these lighter fragrance families. Any composition with a dominant fresh, clean, or watery character will be disrupted by even a slight overdose of sulfurol.

Sulfurol is one of those ingredients that permanently changes how you think about dosing. The first time I worked with it seriously, I overdosed a leather accord by what felt like a negligible margin — and what returned from the blotter an hour later was unrecognizable. That experience is, I believe, the required tuition every perfumer pays to learn what trace-use truly means. When controlled correctly, sulfurol does something rare: it makes a fragrance feel used, inhabited, textured. A leather accord without it smells like leather. With it at the right concentration, it smells like leather that has been worn. That distinction is everything in serious perfumery.

ADVANCED TIP : Prepare a 1 percent stock dilution of sulfurol in perfumer's alcohol and work exclusively from this solution for all blending work. Use a calibrated micro-pipette graduated in single microliters and add to your accord in 1 to 3 µL increments into a 100g base. Evaluate on a skin strip at body temperature after each addition, allowing 30 minutes before deciding whether to increase the dose. This method gives you the precision required to land at the exact threshold where sulfurol enhances rather than overwhelms — which is a very narrow window that is worth finding carefully.

Physical State : Liquid at room temperature
Skin Safety : Potential sensitizer at undiluted concentrations; always use pre-diluted; patch test on diluted form before cosmetic application
Eye Contact : Avoid all direct contact; flush immediately with clean water for 15 minutes if contact occurs; seek medical attention
Ingestion : Not for consumption under any circumstances; seek immediate medical attention if accidentally ingested
Ventilation : Work in well-ventilated space or under a fume hood; vapors are intensely potent and irritating at concentrated levels
Storage : Cool, dark, and dry location; tightly sealed amber glass container; away from heat sources and direct sunlight
Shelf Life : 24 to 36 months when stored correctly under recommended conditions; verify with supplier
Container : Amber glass strongly preferred; HDPE acceptable as secondary option; avoid PVC and untested plastics
Flammability : Combustible liquid; keep away from open flames and ignition sources; flash point approximately 85°C

Q: What does sulfurol smell like at working concentration?
A: At trace dilution, sulfurol smells roasted, dark, and coffee-like with a dry smoky quality. At full concentration it is intensely sulfurous and harsh, which is why pre-dilution before use is always required.

Q: How do I measure such a small amount for my formula?
A: Pre-dilute sulfurol to a 1 percent solution in DPG or perfumer's alcohol, then use a calibrated micro-pipette. This makes precise dosing practical and gives you the control needed to work safely within the 0.001 to 0.05 percent range.

Q: Can I use sulfurol in cold-process soap?
A: It is technically possible at trace concentrations but not commonly recommended. The high pH environment of cold-process soap may affect the character of sulfurous compounds. Stability testing on a small batch is essential before full production.

Q: Is sulfurol safe to use in skin-contact products?
A: At the recommended trace concentrations and properly diluted, it can be incorporated into skin-contact formulas. However, skin sensitization potential requires that you patch test diluted samples, observe IFRA guidance, and stay within safe usage rate limits for each product category.

Q: How does sulfurol compare to other sulfurous materials like dimethyl sulfide or birch tar?
A: Sulfurol has a more roasted, coffee-oriented sulfurous character compared to dimethyl sulfide, which is cabbagey and gaseous, and birch tar, which is phenolic and tarry. Sulfurol is less harsh and more versatile as a trace modifier in fine fragrance and attar blending, making it the more accessible entry point into sulfurous perfumery for DIY formulators.

Product evaluation

Review the specifications, supplied grade, intended use and compatibility of Sulfurol before ordering for production. Test a small quantity in the actual application and document the result before scaling.

Quality control

Inspect the received batch for expected appearance, odor, texture, packaging condition and labeling. Keep supplier and batch records, use accurate measurements, and retain a reference sample when the material is used commercially.

Storage and responsible use

Store tightly closed in a clean, cool and dry location away from direct sunlight. Follow the current supplier instructions and all safety, labeling and regulatory requirements that apply to the intended finished product.