Chemistry of Oo · Olfactive Taxonomy · v1.0
The fragrance
periodic table
An open classification system for fragrance accords. 27 elements, ordered by molecular weight. A shared language for perfumers, educators, researchers, and developers.
Fragrance has never had
a periodic table.
Colour has Pantone.
Music has MIDI.
Fragrance has nothing.
Until now.
Behaviour,
not just identity
Most systems ask "what is this?" The Chemistry of Oo taxonomy asks "how does this perform?" Each accord is a coordinate in olfactive space — defined by molecular weight, volatility, and character — not just a category label.
Machine-readable
from the start
A fragrance profile expressed as Ro(P) · Am(S) · Mu(T) is a vector, not a word. It can be searched, compared, clustered, and used to train AI — enabling capabilities that descriptive systems simply cannot support.
Open and
community-governed
The schema is published under CC BY 4.0. Anyone can use it, build on it, or contribute to it. Changes go through a public RFC process. Chemistry of Oo maintains stewardship — not ownership — of the standard.
Select any element
to explore it
Classification as
a vector
A fragrance profile is expressed as a weighted accord vector. Three weights — Primary, Secondary, Tertiary — describe how prominently each accord features in the composition.
Built to be
built upon
The Chemistry of Oo taxonomy is published under CC BY 4.0. Use it freely in any product, research, or application — attribution required.
What PANTONE did for colour, what MIDI did for music — fragrance has never had its equivalent. Until now.
Chemistry of Oo · Oo La Lab · 2026- Download the specificationThe full v1.0 spec with classification guidelines, versioning, and RFC process. Citable, DOI-registered, versioned.
- Machine-readable JSONAll 27 accords in structured JSON — code, name, tier, character, example ingredients. Free to integrate.
- RFC processPropose additions or refinements via the public RFC process. 30-day comment period. Community-governed evolution.
- Certified encoder programmeFor practitioners who classify formulas against the taxonomy. Coming soon — join the waitlist.
- Cite this taxonomyChemistry of Oo Olfactive Taxonomy Specification, v1.0 (2026). oola-lab.com · DOI: 10.5281/zenodo.20031930
The taxonomy improves
with wider use
Contribute a fragrance classification, suggest an ingredient, propose an RFC, or integrate the taxonomy into your own tools. The standard belongs to the community.