Transparent, clean, near-neutral. The ideal water accord has no dominant character — not marine, not rain, not river, just a sense of liquid freshness. In practice, most water accords lean slightly ozonic-mineral. Cooler than air, cleaner than fog, with a mineral transparency that reads as inorganic purity.
Evolution over time
Immediately
Immediately
Clean, ozonic-mineral freshness, transparent
After a few hours
After a few hours
Near-neutral, faint mineral quality
After a few days
After a few days
Essentially gone — water accords are deliberately ephemeral
The Full Story
Pure water (H2O) is odorless. What humans perceive as 'water smell' is always something dissolved in or released by water: chlorine and chloramines in tap water, geosmin and 2-methylisoborneol from cyanobacteria in lake water, dimethyl sulfide from marine algae in sea water, or petrichor (ozone and geosmin) during rain.
In perfumery, 'water' as a note refers to an accord that carries the impression of water without actually smelling of any particular water source. It is typically built from ozonic-marine molecules (calone, Helional), mineral notes, and clean musks. The challenge is creating something that reads as 'water' while avoiding the specific signatures of rain, sea, or river.
The water accord emerged as a distinct category in the early 1990s with the rise of aquatic fragrances. It sits at the intersection of marine, ozonic, and clean families — a transparent, neutral freshness that reads as elemental rather than botanical.
The 'smell of rain' (petrichor) was named by two Australian researchers, Bear and Thomas, in a 1964 paper in Nature. The smell comes from geosmin (produced by soil bacteria Streptomyces) and ozone (O3), both released when raindrops hit dry earth and aerosolize its contents.
Extraction & Chemistry
Extraction method: Not a natural extract. Water has no fragrance. Water accords are composed from synthetic ozonic, mineral, and clean materials.
Molecular Formula
H2O
CAS Number
7732-18-5
Botanical Name
N/A — inorganic compound
IFRA Status
No known restrictions
Synonyms
AQUA · HYDROGEN OXIDE · DIHYDROGEN MONOXIDE
Physical Properties
Appearance
Colorless transparent liquid
Flash Point
152.00 °F. TCC ( 66.67 °C. )
Specific Gravity
0.89900 to 0.98900 @ 25.00 °C.
Refractive Index
1.46000 to 1.48000 @ 20.00 °C.
In Perfumery
Water is a conceptual top-to-heart accord providing transparent, elemental freshness. Built from ozonic molecules (calone at low doses), Helional, clean musks, and mineral notes. It functions as a neutral freshness carrier — a canvas rather than a color. Used in aquatic, clean, and minimalist compositions. The challenge is avoiding the melon-watermelon artifact of calone at higher concentrations.