In short
Orris butter is the concrete obtained by steam distillation of aged orris (iris) rhizomes. It is waxy at room temperature because of its myristic acid, and it is among the most expensive perfumery materials.
What Orris Butter (Orris Concrete) smells like
Orris butter (orris concrete), the waxy distillate of long-aged iris rhizomes, is woody and fatty-oily yet distinctly violet-like: sweet, floral, warm and tenacious with a fruity undertone. Suppliers describe a complex violet-powdery aroma with woody and earthy undertones and a buttery-carrot nuance. Its violet character comes from irones, which develop only during years of storage; irone-rich grades are smoother, more floral and more buttery. A perfumery writer compares it to crunchy peanut butter, with a bitterness that irone-only materials smooth out.
- Leading note
- Buttery orris
- Clear facets
- Violet-powdery
- Supporting facets
- Carrot-like root, earthy
- Faint facets
- Nutty
- Character
- Powdery, buttery, cool, tenacious
What makes Orris Butter (Orris Concrete) distinctive
Root and butter as well as violet: the earthy, fatty, carrot-like body around the irones' powder is what no synthetic quite reproduces.
How Orris Butter (Orris Concrete) is used
Used as a precious base note and fixative in iris, powdery and fine floral compositions; it shows its full strength in the drydown.
Typical role: modifier (used in small amounts to change the character of a blend); fixative (slow to evaporate; helps a blend last and holds lighter notes).
How Orris Butter (Orris Concrete) differs from similar materials
- alpha-Irone
- Alpha-irone is the orris powder isolated — smoother and cleaner; the butter adds fatty, earthy, carrot-like root notes.
- Carrot Seed Oil
- A supplier says carrot seed oil, paired with cedarwood, can mimic orris butter's powdery, suede-like character; orris is more violet and buttery. (compared directly by a cited source)
- Orris Absolute
- Orris absolute is purified from the butter: cleaner, more intensely floral, higher in irones and without the waxes.
- Orris Resinoid (Iris germanica)
- The germanica resinoid is solvent-extracted rather than distilled: sweeter, with chocolate and berry notes.
An asterisk marks a difference that a cited source states directly. The others compare the published descriptions of each material. Smell varies with grade, supplier and dilution; compare them side by side on blotters before substituting one for another.
Formulation considerations
Solid at room temperature; warm gently and dissolve before weighing. The rhizomes are aged for years before processing, which drives the cost.
Identity and classification
- Type
- Concrete
- Origin
- Natural
- Odour family
- Powdery / Woody
- Note position
- Heart to base note
- Physical form at room temperature
- Semi-solid
- Also known as
- Orris root concrete, Iris butter
- Botanical source
- Iris × germanica L. / Iris pallida Lam.
- CAS number
- 8002-73-1
The CAS number was checked on 19 October 2026 against a PubChem substance record that gives it for this material. A natural material is a mixture, so it has no single formula; its composition varies with origin and processing.
Safety and compliance
This page is general information, not a safety assessment or a specification. Confirm identity, composition, IFRA status and allergen content from your supplier's documents for the lot you hold.
Materials it works with
-
alpha-Irone
Aroma chemical · Powdery / Woody — orris, powdery, woody, violet
-
beta-Ionone
Aroma chemical · Powdery / Woody — violet, woody, fruity, raspberry
-
Heliotropin
Aroma chemical · Powdery / Gourmand — powdery, almond, vanilla, floral
-
Isoambrettolide
Aroma chemical · Musky / Fruity — musky, powdery, fruity, soft
-
Cashmeran
Aroma chemical · Woody / Musky — musky, woody, spicy, velvety
Orris Butter (Orris Concrete) is also suggested as a partner on the pages for Azarbre, Costus Oliffac, Iralia Total, Methyl Beta Ionone, Orivone and Orris Absolute.
Used in formulas and accords
Used in 8 published formulas
Orris Butter (Orris Concrete) is an ingredient in 8 perfume formulas in the Formula & Accord Library.
RUŌOD House Originals
Original compositions by RUŌOD House.
Further reading
Questions about Orris Butter (Orris Concrete)
Is Orris Butter (Orris Concrete) natural or synthetic?
Orris Butter (Orris Concrete) is natural. It is a waxy, often solid extract that still contains the plant waxes or fatty acids.
What is the CAS number of Orris Butter (Orris Concrete)?
8002-73-1, the registry number for the concrete as a substance rather than a single molecule. It was checked against PubChem on 19 October 2026.
Which published formulas use Orris Butter (Orris Concrete)?
Orris Butter (Orris Concrete) is used in 8 published formulas in the RUŌOD Lab Formula & Accord Library, including Iris Weather, Musk Cartouche and Nutmeg Snow. Each is listed with a link under "Used in formulas and accords" on this page.
Sources
- PubChem — substance 135360907, checked 19 October 2026.
- The Good Scents Company — orris concrete — odour database.
- Fraterworks — Orris germanica butter 15% irones — distributor's description.
- Perfume Room — Here's what actual orris smells like — published perfumery reference.
- Wikipedia — Orris oil — published perfumery reference.
- Olfactory profile: the RUŌOD Lab team's synthesis of the published descriptions above, reviewed 25 October 2026. Evidence: more than one published description. Classification and the short description: revision 1. Descriptions of odour are judgement, not measurement.