The recordsAll teaching accords

Station 8 of 13 · Accord · the record

A rose, from four molecules

A rose note built from four of its molecules, to smell how a rose is put together.

Teaching accord A teaching accord for learning: not a Radler formula, not a finished perfume, not safety-assessed; do not make it for skin.

Phenylethyl alcohol, citronellol and geraniol make the body; a trace of β-damascenone gives the fruity edge. Take one away and the rose changes shape: that is the lesson.

Read the essay

The record

Each field carries its evidence: open a chip for the source, the quoted words and the confidence. A field with nothing behind it says so and stays empty.

Name
A rose, from four molecules
house interpretation

the house’s own reading, labelled as such

the house’s name for this teaching accord

confidence C

Purpose
teaching
house rule

the house’s own reading, labelled as such

the site’s rule: every accord on record is a teaching accord; the house’s own formulas never enter the repository (brief §12.7)

confidence B

Structure
A rose note assembled from four molecules the filed rose studies name: phenylethyl alcohol, citronellol and geraniol as the body, and a trace of β-damascenone for the fruity, jammy edge.
house interpretation

the house’s own reading, labelled as such

the choice of the four is the house’s; each molecule’s place in rose oil is documented on the component

confidence B

Family
floral (rose)
perfumery convention

the trade’s shared vocabulary; no single source

a rose soliflore by the trade’s convention

confidence B

Components
Under each component, the evidence for its place in the accord. Teaching parts are a house interpretation for learning: modeled, not measured, not a formula.
ComponentRoleTeaching partsVolatility
2-phenylethyl alcohol
documented

phenyl ethyl alcohol

S4 · Xiao Z, Li J, Niu Y, Liu Q, Liu J · read 2026-09-27

the component is a named constituent of rose otto (rose oil; Bulgarsko rozovo maslo, PGI) (that record’s identity field); S4 lists it among the important rose-oil odorants (abstract; species not stated)

confidence A

heart
documented

Floral notes, such as rose, jasmine, orange blossom, or lavender, are typically middle notes defining the “heart” of many perfumes

KLE-1 · Kleoff M, Kiler P, Heretsch P · read 2026-09-30

the review names rose among the floral heart notes

confidence A

45 parts
modeled

modeled

teaching proportions, a house interpretation for learning: modeled, not measured, not a formula, not for making

confidence C

not on record
why

no volatility class on record for phenylethyl-alcohol

Citronellol
measured

Acyclic monoterpene alcohols citronellol (20.35-44.75%) and geraniol (15.63-27.76%) were highest

S6 · Kumar A, Gautam RD, Singh S, Chauhan R, Kumar M, Kumar D, Kumar A, Singh S · read 2026-09-27
S4 · Xiao Z, Li J, Niu Y, Liu Q, Liu J · read 2026-09-27
GC-2 · Ulusoy S, Boşgelmez-Tınaz G, Seçilmiş-Canbay H · read 2026-09-27

the component is a named constituent of rose otto (rose oil; Bulgarsko rozovo maslo, PGI) (that record’s identity field)

confidence A

heart
documented

Floral notes, such as rose, jasmine, orange blossom, or lavender, are typically middle notes defining the “heart” of many perfumes

KLE-1 · Kleoff M, Kiler P, Heretsch P · read 2026-09-30

the review names rose among the floral heart notes

confidence A

30 parts
modeled

modeled

teaching proportions, a house interpretation for learning: modeled, not measured, not a formula, not for making

confidence C

not on record
why

no volatility class on record for citronellol

Geraniol
measured

geraniol (15.63-27.76%)

S6 · Kumar A, Gautam RD, Singh S, Chauhan R, Kumar M, Kumar D, Kumar A, Singh S · read 2026-09-27
GC-2 · Ulusoy S, Boşgelmez-Tınaz G, Seçilmiş-Canbay H · read 2026-09-27

the component is a named constituent of rose otto (rose oil; Bulgarsko rozovo maslo, PGI) (that record’s identity field)

confidence A

heart
documented

Floral notes, such as rose, jasmine, orange blossom, or lavender, are typically middle notes defining the “heart” of many perfumes

KLE-1 · Kleoff M, Kiler P, Heretsch P · read 2026-09-30

the review names rose among the floral heart notes

confidence A

24.9 parts
modeled

modeled

teaching proportions, a house interpretation for learning: modeled, not measured, not a formula, not for making

confidence C

not on record
why

no volatility class on record for geraniol

β-damascenone
documented

Several of the key flavor compounds in rose essential oil are C(13)-norisoprenoids, such as beta-damascenone

S5 · Huang FC, Horváth G, Molnár P, Turcsi E, Deli J, Schrader J, Sandmann G, Schmidt H, Schwab · read 2026-09-27

the component is a named constituent of rose otto (rose oil; Bulgarsko rozovo maslo, PGI) (that record’s identity field)

confidence A

trace
perfumery convention

the trade’s shared vocabulary; no single source

a trace: its odour threshold on record is very low (the molecule record), so a trace is enough by convention

confidence B

0.1 parts
modeled

modeled

teaching proportions, a house interpretation for learning: modeled, not measured, not a formula, not for making

confidence C

not on record
why

no volatility class on record for beta-damascenone

Substitutions
  • For 2-phenylethyl alcohol (phenylethyl alcohol, PEA): Rose absolute in place of phenylethyl alcohol: the absolute’s primary component on record is phenylethyl alcohol. (rose absolute)
    inferred

    This represents the initial study to examine the antibiofilm and antivirulence capabilities of rose absolute and its primary component, phenylethyl alcohol.

    GC-1 · Çevikbaş H, Ulusoy S, Kaya Kinaytürk N · read 2026-09-27

    inferred from the rose absolute record; the absolute brings its other constituents with it

    confidence B

Regulations that apply to a component
Odour descriptors

Causal Debugger why did this change matter?

Teaching accord · modeled A teaching accord for learning: not a Radler formula, not a finished perfume, not safety-assessed; do not make it for skin. Everything below is computed by a teaching model from the records: modeled, not measured, and not a prediction of how any real perfume smells. Regulation lines are flags, not compliance advice.

Change one thing and follow it down the chain: the proportions, the molecules, the words on record, a modeled reading, the dry-down, odour activity where a threshold is measured, the regulations, the provenance. Then: why it mattered.

One change

Without JavaScript these controls stay still: every single change is worked out below.

Modeled · before → after

Choose one component and one change: each layer of the chain appears here, labelled modeled, each input with its evidence.

What happens if… every single change, worked out

The same model, run when this page was built. Figures are modeled: parts, and shares per 100 parts; odour space is the share of the accord whose components carry each word; the dry-down uses the half-lives top 1.5 h, heart 6 h, base 12 h (the simulator’s site constants, not measurements); odour activity is share ÷ measured threshold, compared within one medium and unit, never across (a teaching ratio, not a measurement of this accord). This teaching accord is not a finished product and is not assessed. Nothing is for sale.

Double 2-phenylethyl alcohol (×2)
1 · Composition
2-phenylethyl alcohol 45 → 90 parts (45.0 → 62.1 per 100); the others ×0.69.
2 · Molecules
2-phenylethyl alcohol itself rises.
3 · Odour space
“floral” 45.0 → 62.1, “honey” 45.0 → 62.1, “rose” 55.0 → 37.9, “soapy” 30.0 → 20.7.
4 · Perceived character
A modeled reading, not a prediction: more “floral” and “honey” and less “rose” and “soapy”.
5 · Dry-down
top / heart / base 0.0 / 99.9 / 0.0 → 0.0 / 99.9 / 0.0; half gone at 6.0 h → 6.0 h; no class on record, left out: β-damascenone. The curve cannot move: every component with a class is heart.
6 · Odour activity
2-phenylethyl alcohol (140 µg/kg in water, measured): ×1.38; lead in water (µg/kg): geraniol; 2-phenylethyl alcohol 0.01 → 0.03 of the leader.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. Components carrying “floral” go from 45.0 to 62.1 per 100 parts, because 2-phenylethyl alcohol carries it (its descriptors field).
Remove 2-phenylethyl alcohol
1 · Composition
2-phenylethyl alcohol 45 → 0 parts (45.0 → 0.0 per 100); the others ×1.82.
2 · Molecules
2-phenylethyl alcohol itself leaves.
3 · Odour space
“floral” 45.0 → 0.0, “honey” 45.0 → 0.0, “rose” 55.0 → 100.0, “soapy” 30.0 → 54.5.
4 · Perceived character
A modeled reading, not a prediction: more “rose” and “soapy” and no “floral” and “honey” left.
5 · Dry-down
top / heart / base 0.0 / 99.9 / 0.0 → 0.0 / 99.8 / 0.0; half gone at 6.0 h → 6.0 h; no class on record, left out: β-damascenone. The curve cannot move: every component with a class is heart.
6 · Odour activity
2-phenylethyl alcohol (140 µg/kg in water, measured): ×0; lead in water (µg/kg): geraniol.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. 2-phenylethyl alcohol carried “floral” and no other component does on record, so the word leaves the modeled profile.
  2. 2-phenylethyl alcohol carried “honey” and no other component does on record, so the word leaves the modeled profile.
  3. Components carrying “rose” go from 55.0 to 100.0 per 100 parts, because 2-phenylethyl alcohol, which does not carry it, now takes less of the accord.
Double citronellol (×2)
1 · Composition
citronellol 30 → 60 parts (30.0 → 46.2 per 100); the others ×0.77.
2 · Molecules
citronellol itself rises.
3 · Odour space
“soapy” 30.0 → 46.2, “rose” 55.0 → 65.4, “floral” 45.0 → 34.6, “honey” 45.0 → 34.6.
4 · Perceived character
A modeled reading, not a prediction: more “soapy” and “rose” and less “floral” and “honey”.
5 · Dry-down
top / heart / base 0.0 / 99.9 / 0.0 → 0.0 / 99.9 / 0.0; half gone at 6.0 h → 6.0 h; no class on record, left out: β-damascenone. The curve cannot move: every component with a class is heart.
6 · Odour activity
citronellol: no threshold on record.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. Components carrying “soapy” go from 30.0 to 46.2 per 100 parts, because citronellol carries it (its descriptors field).
Remove citronellol
1 · Composition
citronellol 30 → 0 parts (30.0 → 0.0 per 100); the others ×1.43.
2 · Molecules
citronellol itself leaves.
3 · Odour space
“soapy” 30.0 → 0.0, “floral” 45.0 → 64.3, “honey” 45.0 → 64.3, “rose” 55.0 → 35.7.
4 · Perceived character
A modeled reading, not a prediction: more “floral” and “honey”, less “rose” and no “soapy” left.
5 · Dry-down
top / heart / base 0.0 / 99.9 / 0.0 → 0.0 / 99.9 / 0.0; half gone at 6.0 h → 6.0 h; no class on record, left out: β-damascenone. The curve cannot move: every component with a class is heart.
6 · Odour activity
citronellol: no threshold on record.
7 · Regulation flags
Flags leaving the accord: Regulation (EU) 2023/1545 (labelling of fragrance allergens).
Why did this change matter?
  1. It takes the “Regulation (EU) 2023/1545 (labelling of fragrance allergens)” flag (a labelling condition, extended to more fragrance allergens) off the accord: it names citronellol and no other component.
  2. citronellol carried “soapy” and no other component does on record, so the word leaves the modeled profile.
  3. Components carrying “floral” go from 45.0 to 64.3 per 100 parts, because citronellol, which does not carry it, now takes less of the accord.
Double geraniol (×2)
1 · Composition
geraniol 24.9 → 49.8 parts (24.9 → 39.9 per 100); the others ×0.80.
2 · Molecules
geraniol itself rises.
3 · Odour space
“citrus” 24.9 → 39.9, “rose” 55.0 → 64.0, “floral” 45.0 → 36.0, “honey” 45.0 → 36.0.
4 · Perceived character
A modeled reading, not a prediction: more “citrus” and “rose” and less “floral” and “honey”.
5 · Dry-down
top / heart / base 0.0 / 99.9 / 0.0 → 0.0 / 99.9 / 0.0; half gone at 6.0 h → 6.0 h; no class on record, left out: β-damascenone. The curve cannot move: every component with a class is heart.
6 · Odour activity
geraniol (1.1 µg/kg in water, measured): ×1.60; lead in water (µg/kg): geraniol.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. Components carrying “citrus” go from 24.9 to 39.9 per 100 parts, because geraniol carries it (its descriptors field).
Remove geraniol
1 · Composition
geraniol 24.9 → 0 parts (24.9 → 0.0 per 100); the others ×1.33.
2 · Molecules
geraniol itself leaves.
3 · Odour space
“citrus” 24.9 → 0.0, “floral” 45.0 → 59.9, “honey” 45.0 → 59.9, “rose” 55.0 → 40.1.
4 · Perceived character
A modeled reading, not a prediction: more “floral” and “honey”, less “rose” and no “citrus” left.
5 · Dry-down
top / heart / base 0.0 / 99.9 / 0.0 → 0.0 / 99.9 / 0.0; half gone at 6.0 h → 6.0 h; no class on record, left out: β-damascenone. The curve cannot move: every component with a class is heart.
6 · Odour activity
geraniol (1.1 µg/kg in water, measured): ×0; lead in water (µg/kg): geraniol → β-damascenone.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. In odour activity (share ÷ measured threshold, compared in water, µg/kg), the lead passes from geraniol to β-damascenone: a trace with a low threshold counts far beyond its share.
  2. geraniol carried “citrus” and no other component does on record, so the word leaves the modeled profile.
  3. Components carrying “floral” go from 45.0 to 59.9 per 100 parts, because geraniol, which does not carry it, now takes less of the accord.
Double β-damascenone (×2)
1 · Composition
β-damascenone 0.1 → 0.2 parts (0.1 → 0.2 per 100); the others ×1.00.
2 · Molecules
β-damascenone itself rises.
3 · Odour space
“fruity” 0.1 → 0.2, “jammy” 0.1 → 0.2.
4 · Perceived character
A modeled reading: the words on record barely move, and neither does the dry-down.
5 · Dry-down
top / heart / base 0.0 / 99.9 / 0.0 → 0.0 / 99.8 / 0.0; half gone at 6.0 h → 6.0 h; no class on record, left out: β-damascenone. The curve cannot move: every component with a class is heart.
6 · Odour activity
β-damascenone (0.006 µg/kg in water, measured): ×2.00; lead in water (µg/kg): geraniol → β-damascenone.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. In odour activity (share ÷ measured threshold, compared in water, µg/kg), the lead passes from geraniol to β-damascenone, although β-damascenone is just 0.2 parts: a trace with a low threshold counts far beyond its share.
Remove β-damascenone
1 · Composition
β-damascenone 0.1 → 0 parts (0.1 → 0.0 per 100); the others ×1.00.
2 · Molecules
β-damascenone itself leaves.
3 · Odour space
“fruity” 0.1 → 0.0, “jammy” 0.1 → 0.0.
4 · Perceived character
A modeled reading, not a prediction: no “fruity” and “jammy” left.
5 · Dry-down
top / heart / base 0.0 / 99.9 / 0.0 → 0.0 / 100.0 / 0.0; half gone at 6.0 h → 6.0 h; no class on record, left out: β-damascenone. The curve cannot move: every component with a class is heart.
6 · Odour activity
β-damascenone (0.006 µg/kg in water, measured): ×0; lead in water (µg/kg): geraniol.
7 · Regulation flags
Flags leaving the accord: IFRA Standard: Rose ketones.
Why did this change matter?
  1. It takes the “IFRA Standard: Rose ketones” flag (restriction) off the accord: it names β-damascenone and no other component.
  2. β-damascenone carried “fruity” and no other component does on record, so the word leaves the modeled profile.
  3. β-damascenone carried “jammy” and no other component does on record, so the word leaves the modeled profile.
Replace 2-phenylethyl alcohol with rose absolute
1 · Composition
2-phenylethyl alcohol 45 → 0 parts (45.0 → 0.0 per 100); rose absolute 0 → 45 parts (0.0 → 45.0 per 100); the others ×1.00.
2 · Molecules
2-phenylethyl alcohol itself leaves; with rose absolute arrive 2-phenylethyl alcohol, citronellol, geraniol and β-damascenone (no shares on record).
3 · Odour space
“spicy” 0.0 → 45.0.
4 · Perceived character
A modeled reading, not a prediction: “spicy” arriving.
5 · Dry-down
top / heart / base 0.0 / 99.9 / 0.0 → 0.0 / 99.9 / 0.0; half gone at 6.0 h → 6.0 h; no class on record, left out: β-damascenone. The curve cannot move: every component with a class is heart.
6 · Odour activity
2-phenylethyl alcohol (140 µg/kg in water, measured): ×0; rose absolute: no threshold on record; lead in water (µg/kg): geraniol.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. rose absolute brings “spicy”, which no other component carries on record.

What the model reads, with its evidence

2-phenylethyl alcohol
descriptors: floral, honey
documented

OT-1 · listed on the record

field: molecule/phenylethyl-alcohol · descriptors · in this repository: OT-1

· class: heart (role) · threshold: 140 µg/kg in water
measured

OT-1 · listed on the record

field: molecule/phenylethyl-alcohol · threshold · in this repository: OT-1

· regulation: none on record · provenance: occurs in rose absolute; occurs in rose otto
citronellol
descriptors: soapy, rose
documented

OT-1 · listed on the record

field: molecule/citronellol · descriptors · in this repository: OT-1

· class: heart (role) · threshold: not on record · regulation: Regulation (EC) No 1223/2009 on cosmetic products (a labelling condition (Annex III)); Regulation (EU) 2023/1545 (labelling of fragrance allergens) (a labelling condition, extended to more fragrance allergens) · provenance: occurs in rose otto; occurs in rose absolute
geraniol
descriptors: rose, citrus
documented

OT-1 · listed on the record

field: molecule/geraniol · descriptors · in this repository: OT-1

· class: heart (role) · threshold: 1.1 µg/kg in water
measured

OT-1 · listed on the record

field: molecule/geraniol · threshold · in this repository: OT-1

· regulation: Regulation (EC) No 1223/2009 on cosmetic products (a labelling condition (Annex III)) · provenance: occurs in rose otto; occurs in rose absolute
β-damascenone
descriptors: rose, fruity, jammy
house interpretation

the house’s own reading, labelled as such

field: molecule/beta-damascenone · descriptors · in this repository: the page’s own data (a script, not a section)

· class: none on record · threshold: 0.006 µg/kg in water
measured

OT-1 · listed on the record

field: molecule/beta-damascenone · threshold · in this repository: OT-1

· regulation: IFRA Standard: Rose ketones (restriction) · provenance: occurs in rose otto; occurs in rose absolute
rose absolute (a substitute)
descriptors: honey, spicy, floral
house interpretation

the house’s own reading, labelled as such

field: material/rose-absolute · descriptors · in this repository: /materials, “The Precious Materials”

· class: heart (role) · threshold: not on record · regulation: Regulation (EU) 2023/1545 (labelling of fragrance allergens) (a labelling condition, extended to more fragrance allergens) · provenance: from Rosa damascena Mill.; grown in Kazanlak, Rose Valley; grown in Taif

the model’s input as data: /data/causal/rose-teaching-accord.json · the model and its formulas: the site’s build

Sources

  1. KLE-1 · Kleoff M, Kiler P, Heretsch P. Synthesis of odorants in flow and their applications in perfumery. Beilstein J Org Chem. 2022;18:754–768. doi.org/10.3762/bjoc.18.76 · read 2026-09-30 · CC BY 4.0
  2. S4 · Xiao Z, Li J, Niu Y, Liu Q, Liu J. Verification of key odorants in rose oil by gas chromatography-olfactometry/aroma extract dilution analysis, odour activity value and aroma recombination. Natural Product Research 2017;31(19):2294–2302. DOI 10.1080/14786419.2017.1303693. PMID 28347181. doi.org/10.1080/14786419.2017.1303693 · read 2026-09-27
  3. S6 · Kumar A, Gautam RD, Singh S, Chauhan R, Kumar M, Kumar D, Kumar A, Singh S. Phenotyping floral traits and essential oil profiling revealed considerable variations in clonal selections of damask rose (Rosa damascena Mill.). Scientific Reports 2023;13:8101. DOI 10.1038/s41598-023-34972-5. PMID 37208367. PMCID PMC10198992. doi.org/10.1038/s41598-023-34972-5 · read 2026-09-27 · CC BY (Europe PMC)
  4. GC-2 · Ulusoy S, Boşgelmez-Tınaz G, Seçilmiş-Canbay H. Tocopherol, carotene, phenolic contents and antibacterial properties of rose essential oil, hydrosol and absolute. Current Microbiology 2009;59(5):554–558. DOI 10.1007/s00284-009-9475-y. PMID 19688375. doi.org/10.1007/s00284-009-9475-y · read 2026-09-27
  5. S5 · Huang FC, Horváth G, Molnár P, Turcsi E, Deli J, Schrader J, Sandmann G, Schmidt H, Schwab W. Substrate promiscuity of RdCCD1, a carotenoid cleavage oxygenase from Rosa damascena. Phytochemistry 2009;70:457–464. DOI 10.1016/j.phytochem.2009.01.020. PMID 19264332. doi.org/10.1016/j.phytochem.2009.01.020 · read 2026-09-27
  6. GC-1 · Çevikbaş H, Ulusoy S, Kaya Kinaytürk N. Exploring rose absolute and phenylethyl alcohol as novel quorum sensing inhibitors in Pseudomonas aeruginosa and Chromobacterium violaceum. Scientific Reports 2024;14:15666. DOI 10.1038/s41598-024-66888-z. PMID 38977845. PMCID PMC11231148. doi.org/10.1038/s41598-024-66888-z · read 2026-09-27 · CC BY (Europe PMC)

These records are published under CC BY 4.0.

this record as data: /data/accord/rose-teaching-accord.json · version 1 · updated 2026-09-30 · confidence A