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A muguet (lily of the valley), and what regulation took from it · the worked cases

Worked out when the page was built

The HTML equivalents of the accord’s two tools, for reading without JavaScript. Back to A muguet (lily of the valley), and what regulation took from it.

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 hydroxycitronellal (×2)
1 · Composition
hydroxycitronellal 40 → 80 parts (40.0 → 57.1 per 100); the others ×0.71.
2 · Molecules
hydroxycitronellal itself rises.
3 · Odour space
“floral” 20.0 → 14.3, “honey” 20.0 → 14.3, “lily” 20.0 → 14.3, “medicinal” 15.0 → 10.7; no descriptor on record: 45.0 → 60.7.
4 · Perceived character
A modeled reading, not a prediction: less “floral” and “honey”, with less of it in the opening.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 10.7 / 89.3 / 0.0; half gone at 4.9 h → 5.2 h.
6 · Odour activity
hydroxycitronellal: no threshold on record.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. The modeled dry-down moves: heart-class components go from 85.0 to 89.3 per 100 parts, and half the accord is gone at 5.2 h instead of 4.9 h (hydroxycitronellal is heart, from its role in the accord).
  2. Components carrying “floral” go from 20.0 to 14.3 per 100 parts, because hydroxycitronellal, which does not carry it, now takes more of the accord.
Remove hydroxycitronellal
1 · Composition
hydroxycitronellal 40 → 0 parts (40.0 → 0.0 per 100); the others ×1.67.
2 · Molecules
hydroxycitronellal itself leaves.
3 · Odour space
“floral” 20.0 → 33.3, “honey” 20.0 → 33.3, “lily” 20.0 → 33.3, “medicinal” 15.0 → 25.0; no descriptor on record: 45.0 → 8.3.
4 · Perceived character
A modeled reading, not a prediction: more “floral” and “honey”, with more of it in the opening.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 25.0 / 75.0 / 0.0; half gone at 4.9 h → 4.2 h.
6 · Odour activity
hydroxycitronellal: no threshold on record.
7 · Regulation flags
Flags leaving the accord: IFRA Standard: Hydroxycitronellal.
Why did this change matter?
  1. It takes the “IFRA Standard: Hydroxycitronellal” flag (restriction) off the accord: it names hydroxycitronellal and no other component.
  2. The modeled dry-down moves: heart-class components go from 85.0 to 75.0 per 100 parts, and half the accord is gone at 4.2 h instead of 4.9 h (hydroxycitronellal is heart, from its role in the accord).
  3. Components carrying “floral” go from 20.0 to 33.3 per 100 parts, because hydroxycitronellal, which does not carry it, now takes less of the accord.
Double butylphenyl methylpropional (×2)
1 · Composition
butylphenyl methylpropional 20 → 40 parts (20.0 → 33.3 per 100); the others ×0.83.
2 · Molecules
butylphenyl methylpropional itself rises.
3 · Odour space
“lily” 20.0 → 33.3, “floral” 20.0 → 16.7, “honey” 20.0 → 16.7, “medicinal” 15.0 → 12.5; no descriptor on record: 45.0 → 37.5.
4 · Perceived character
A modeled reading, not a prediction: more “lily” and less “floral” and “honey”.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 12.5 / 87.5 / 0.0; half gone at 4.9 h → 5.1 h.
6 · Odour activity
butylphenyl methylpropional: no threshold on record.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. Components carrying “lily” go from 20.0 to 33.3 per 100 parts, because butylphenyl methylpropional carries it (its descriptors field).
  2. The modeled dry-down moves: heart-class components go from 85.0 to 87.5 per 100 parts, and half the accord is gone at 5.1 h instead of 4.9 h (butylphenyl methylpropional is heart, from its role in the accord).
Remove butylphenyl methylpropional
1 · Composition
butylphenyl methylpropional 20 → 0 parts (20.0 → 0.0 per 100); the others ×1.25.
2 · Molecules
butylphenyl methylpropional itself leaves.
3 · Odour space
“lily” 20.0 → 0.0, “floral” 20.0 → 25.0, “honey” 20.0 → 25.0, “medicinal” 15.0 → 18.8; no descriptor on record: 45.0 → 56.3.
4 · Perceived character
A modeled reading, not a prediction: more “floral” and “honey” and no “lily” left, with more of it in the opening.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 18.8 / 81.3 / 0.0; half gone at 4.9 h → 4.6 h.
6 · Odour activity
butylphenyl methylpropional: no threshold on record.
7 · Regulation flags
Flags leaving the accord: Regulation (EU) 2021/1902 (substances classified CMR, butylphenyl methylpropional among them); IFRA Standard: p-tert-Butyl-α-methylhydrocinnamic aldehyde (p-BMHCA).
Why did this change matter?
  1. It takes the “Regulation (EU) 2021/1902 (substances classified CMR, butylphenyl methylpropional among them)” flag (a prohibition (Annex II)) off the accord: it names butylphenyl methylpropional and no other component.
  2. It takes the “IFRA Standard: p-tert-Butyl-α-methylhydrocinnamic aldehyde (p-BMHCA)” flag (restriction / prohibition) off the accord: it names butylphenyl methylpropional and no other component.
  3. butylphenyl methylpropional carried “lily” and no other component does on record, so the word leaves the modeled profile.
Double HICC (×2)
1 · Composition
HICC 5 → 10 parts (5.0 → 9.5 per 100); the others ×0.95.
2 · Molecules
HICC itself rises.
3 · Odour space
“floral” 20.0 → 19.0, “honey” 20.0 → 19.0, “lily” 20.0 → 19.0, “medicinal” 15.0 → 14.3; no descriptor on record: 45.0 → 47.6.
4 · Perceived character
A modeled reading, not a prediction: less “floral” and “honey”.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 14.3 / 85.7 / 0.0; half gone at 4.9 h (unchanged).
6 · Odour activity
HICC: no threshold on record.
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. Little moves: at 5 parts, HICC’s share goes from 5.0 to 9.5 per 100, so in this share-weighted model the change is nearly invisible, and no measured threshold is on record to show its strength.
Remove HICC
1 · Composition
HICC 5 → 0 parts (5.0 → 0.0 per 100); the others ×1.05.
2 · Molecules
HICC itself leaves.
3 · Odour space
“floral” 20.0 → 21.1, “honey” 20.0 → 21.1, “lily” 20.0 → 21.1, “medicinal” 15.0 → 15.8; no descriptor on record: 45.0 → 42.1.
4 · Perceived character
A modeled reading, not a prediction: more “floral” and “honey”.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 15.8 / 84.2 / 0.0; half gone at 4.9 h → 4.8 h.
6 · Odour activity
HICC: no threshold on record.
7 · Regulation flags
Flags leaving the accord: Regulation (EU) 2017/1410 (HICC, atranol and chloroatranol prohibited); IFRA Standard: 3 and 4-(4-Hydroxy-4-methylpentyl)-3-cyclohexene-1-carboxaldehyde (HMPCC).
Why did this change matter?
  1. It takes the “Regulation (EU) 2017/1410 (HICC, atranol and chloroatranol prohibited)” flag (a prohibition (Annex II)) off the accord: it names HICC and no other component.
  2. It takes the “IFRA Standard: 3 and 4-(4-Hydroxy-4-methylpentyl)-3-cyclohexene-1-carboxaldehyde (HMPCC)” flag (restriction) off the accord: it names HICC and no other component.
  3. Components carrying “floral” go from 20.0 to 21.1 per 100 parts, because HICC, which does not carry it, now takes less of the accord.
Double 2-phenylethyl alcohol (×2)
1 · Composition
2-phenylethyl alcohol 20 → 40 parts (20.0 → 33.3 per 100); the others ×0.83.
2 · Molecules
2-phenylethyl alcohol itself rises.
3 · Odour space
“floral” 20.0 → 33.3, “honey” 20.0 → 33.3, “lily” 20.0 → 16.7, “medicinal” 15.0 → 12.5; no descriptor on record: 45.0 → 37.5.
4 · Perceived character
A modeled reading, not a prediction: more “floral” and “honey” and less “lily” and “medicinal”.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 12.5 / 87.5 / 0.0; half gone at 4.9 h → 5.1 h.
6 · Odour activity
2-phenylethyl alcohol (140 µg/kg in water, measured): ×1.67; no ratio with linalool (air, ng/L).
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. Components carrying “floral” go from 20.0 to 33.3 per 100 parts, because 2-phenylethyl alcohol carries it (its descriptors field).
  2. The modeled dry-down moves: heart-class components go from 85.0 to 87.5 per 100 parts, and half the accord is gone at 5.1 h instead of 4.9 h (2-phenylethyl alcohol is heart, from its role in the accord).
Remove 2-phenylethyl alcohol
1 · Composition
2-phenylethyl alcohol 20 → 0 parts (20.0 → 0.0 per 100); the others ×1.25.
2 · Molecules
2-phenylethyl alcohol itself leaves.
3 · Odour space
“floral” 20.0 → 0.0, “honey” 20.0 → 0.0, “lily” 20.0 → 25.0, “medicinal” 15.0 → 18.8; no descriptor on record: 45.0 → 56.3.
4 · Perceived character
A modeled reading, not a prediction: more “lily” and “medicinal” and no “floral” and “honey” left, with more of it in the opening.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 18.8 / 81.3 / 0.0; half gone at 4.9 h → 4.6 h.
6 · Odour activity
2-phenylethyl alcohol (140 µg/kg in water, measured): ×0; no ratio with linalool (air, ng/L).
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. The modeled dry-down moves: heart-class components go from 85.0 to 81.3 per 100 parts, and half the accord is gone at 4.6 h instead of 4.9 h (2-phenylethyl alcohol is heart, from its role in the accord).
Double linalool (×2)
1 · Composition
linalool 15 → 30 parts (15.0 → 26.1 per 100); the others ×0.87.
2 · Molecules
linalool itself rises.
3 · Odour space
“medicinal” 15.0 → 26.1, “sharp” 15.0 → 26.1, “floral” 20.0 → 17.4, “honey” 20.0 → 17.4; no descriptor on record: 45.0 → 39.1.
4 · Perceived character
A modeled reading, not a prediction: more “medicinal” and “sharp” and less “floral” and “honey”, with more of it in the opening.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 26.1 / 73.9 / 0.0; half gone at 4.9 h → 4.1 h.
6 · Odour activity
linalool (3.2 ng/L in air, measured): ×1.74; no ratio with 2-phenylethyl alcohol (water, µg/kg).
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. The modeled dry-down moves: top-class components go from 15.0 to 26.1 per 100 parts, and half the accord is gone at 4.1 h instead of 4.9 h (linalool is top, from its volatility class, modeled).
  2. Components carrying “medicinal” go from 15.0 to 26.1 per 100 parts, because linalool carries it (its descriptors field).
Remove linalool
1 · Composition
linalool 15 → 0 parts (15.0 → 0.0 per 100); the others ×1.18.
2 · Molecules
linalool itself leaves.
3 · Odour space
“medicinal” 15.0 → 0.0, “sharp” 15.0 → 0.0, “floral” 20.0 → 23.5, “honey” 20.0 → 23.5; no descriptor on record: 45.0 → 52.9.
4 · Perceived character
A modeled reading, not a prediction: more “floral” and “honey” and no “medicinal” and “sharp” left, with less of it in the opening.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 0.0 / 100.0 / 0.0; half gone at 4.9 h → 6.0 h.
6 · Odour activity
linalool (3.2 ng/L in air, measured): ×0; no ratio with 2-phenylethyl alcohol (water, µg/kg).
7 · Regulation flags
The accord’s flags do not change.
Why did this change matter?
  1. linalool carried “medicinal” and no other component does on record, so the word leaves the modeled profile.
  2. linalool carried “sharp” and no other component does on record, so the word leaves the modeled profile.
  3. The modeled dry-down moves: top-class components go from 15.0 to 0.0 per 100 parts, and half the accord is gone at 6.0 h instead of 4.9 h (linalool is top, from its volatility class, modeled).
Replace butylphenyl methylpropional with hydroxycitronellal
1 · Composition
butylphenyl methylpropional 20 → 0 parts (20.0 → 0.0 per 100); hydroxycitronellal 40 → 60 parts (40.0 → 60.0 per 100); the others ×1.00.
2 · Molecules
butylphenyl methylpropional itself leaves; hydroxycitronellal itself rises.
3 · Odour space
“lily” 20.0 → 0.0; no descriptor on record: 45.0 → 65.0.
4 · Perceived character
A modeled reading, not a prediction: no “lily” left.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 15.0 / 85.0 / 0.0; half gone at 4.9 h (unchanged).
6 · Odour activity
butylphenyl methylpropional: no threshold on record; hydroxycitronellal: no threshold on record.
7 · Regulation flags
Flags leaving the accord: Regulation (EU) 2021/1902 (substances classified CMR, butylphenyl methylpropional among them); IFRA Standard: p-tert-Butyl-α-methylhydrocinnamic aldehyde (p-BMHCA).
Why did this change matter?
  1. It takes the “Regulation (EU) 2021/1902 (substances classified CMR, butylphenyl methylpropional among them)” flag (a prohibition (Annex II)) off the accord: it names butylphenyl methylpropional and no other component.
  2. It takes the “IFRA Standard: p-tert-Butyl-α-methylhydrocinnamic aldehyde (p-BMHCA)” flag (restriction / prohibition) off the accord: it names butylphenyl methylpropional and no other component.
  3. butylphenyl methylpropional carried “lily” and no other component does on record, so the word leaves the modeled profile.
Replace HICC with hydroxycitronellal
1 · Composition
HICC 5 → 0 parts (5.0 → 0.0 per 100); hydroxycitronellal 40 → 45 parts (40.0 → 45.0 per 100); the others ×1.00.
2 · Molecules
HICC itself leaves; hydroxycitronellal itself rises.
3 · Odour space
no descriptor on record moves; no descriptor on record: 45.0 → 45.0.
4 · Perceived character
A modeled reading: the words on record barely move, and neither does the dry-down.
5 · Dry-down
top / heart / base 15.0 / 85.0 / 0.0 → 15.0 / 85.0 / 0.0; half gone at 4.9 h (unchanged).
6 · Odour activity
HICC: no threshold on record; hydroxycitronellal: no threshold on record.
7 · Regulation flags
Flags leaving the accord: Regulation (EU) 2017/1410 (HICC, atranol and chloroatranol prohibited); IFRA Standard: 3 and 4-(4-Hydroxy-4-methylpentyl)-3-cyclohexene-1-carboxaldehyde (HMPCC).
Why did this change matter?
  1. It takes the “Regulation (EU) 2017/1410 (HICC, atranol and chloroatranol prohibited)” flag (a prohibition (Annex II)) off the accord: it names HICC and no other component.
  2. It takes the “IFRA Standard: 3 and 4-(4-Hydroxy-4-methylpentyl)-3-cyclohexene-1-carboxaldehyde (HMPCC)” flag (restriction) off the accord: it names HICC and no other component.

Version 1 against version 2

Modeled · A → B

A · Version 1 · Classic: HICC and p-BMHCA → B · Version 2 · Without HICC (EU law)

1 · What changedmodeled

  • hydroxycitronellal: 40 → 45 parts (40.0 → 45.0 per 100)
  • butylphenyl methylpropional: the same 20 parts (20.0 → 20.0 per 100)
  • HICC: removed in B (A: 5 parts, 5.0 per 100)
  • 2-phenylethyl alcohol: the same 20 parts (20.0 → 20.0 per 100)
  • linalool: the same 15 parts (15.0 → 15.0 per 100)
teaching parts · modeled

a modeled value: a stated assumption, not a measurement

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

field: this accord’s record · teaching variants · version 2 · teaching parts

confidence C

2 · Molecules

hydroxycitronellal itself rises; HICC itself leaves.

Hydroxycitronellal · HICC

3 · Odour spacemodeled

No descriptor on record moves; no descriptor on record: 45.0 → 45.0.

hydroxycitronellal: no descriptor on record HICC: no descriptor on record

“floral” · “honey” · “lily” · “medicinal” · “sharp”

4 · A modeled readingmodeled

B against A. A modeled reading: the words on record barely move, and neither does the dry-down.

Generated from the movements above: a modeled reading, not a prediction and not a smell.

5 · Dry-downmodeled

Top / heart / base: 15.0 / 85.0 / 0.0 in A → 15.0 / 85.0 / 0.0 in B, per 100 parts; half the accord gone at 4.9 h → 4.9 h (modeled half-lives: top 1.5 h, heart 6 h, base 12 h).

half-lives · modeled

a modeled value: a stated assumption, not a measurement

the site constants of the evaporation simulator on /science for limonene (its Top note), Hedione (Heart) and Ambroxan (Base); “chosen for the simulator and are not measurements”

hydroxycitronellal: role · perfumery convention

the trade’s shared vocabulary; no single source

the trade’s top / heart / base convention for this material

field: this accord’s record · role

confidence B

6 · Odour activitymodeled

no measured threshold on record for hydroxycitronellal, butylphenyl methylpropional and HICC. Thresholds from different media or units are never compared; a teaching ratio, not a measurement of this accord.

2-phenylethyl alcohol: 140 µg/kg in water · measured

Kreissl et al. (2022). Leibniz-LSB@TUM Odorant Database, Version 1.2 · listed on the record

the retronasal threshold in the same study is 390 µg/kg (OT-1)

field: the 2-phenylethyl alcohol record · threshold

confidence A

linalool: 3.2 ng/L in air · measured

Elsharif et al. (2015). Structure-odor relationships of linalool, linalyl acetate and their corresponding oxygenated derivatives · listed on the record

in water, the racemate 0.58 µg/kg and (R)-linalool 0.087 µg/kg (OT-1); the site’s older figure came from a proprietary compilation (OT-4), withdrawn as a source on 2026-09-30, and is not repeated

field: the linalool record · threshold

confidence A

7 · Regulation flags

A flag follows presence, not dose: a smaller dose keeps the flag (several IFRA Standards on record restrict by concentration in finished products), and a teaching accord is neither a finished product nor assessed. US law: not on record. Not legal advice.

8 · Provenance

No price: nothing on this site is for sale.

Why could it smell different?
  1. B drops two flags that come with HICC, which B leaves out (EU law · a prohibition (Annex II); IFRA: an industry standard, not law · restriction).
    documented

    Amendment 49 3 and 4-(4-Hydroxy-4-methylpentyl)-3-cyclohexene-1-carboxaldehyde (HMPCC)

    International Fragrance Association (IFRA); Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products…; Commission Regulation (EU) 2017/1410 of 2 August 2017 amending Annexes II and III to Regulation (EC) No 1223/2009 · listed on the record

    a house review: the Regulation records that apply to it (educational summaries as of 2026-09-30; not legal advice)

    field: the HICC record · regulation

    confidence A

  2. hydroxycitronellal and HICC carry no descriptor on record, so the modeled words cannot show their part of the change: it is not on record, which is not the same as nothing.
    evidence

    no evidence on record

    no descriptor on record: no house wording on a data file, no descriptor source filed

    field: the hydroxycitronellal record · descriptors

The top causes in the model, each with the record field it rests on. Modeled, not measured; not a prediction of how anything smells.

teaching accord only: not a commercial perfume formula, not for skin · the record