Hydrosols and Floral Waters: The Right INCI to File

Rose water sounds simple until you have to file it. Is it water? Is it a botanical extract? Both, actually, and that's exactly the naming pattern that trips people up when a hydrosol or floral water goes into a CNF ingredient list.

What a hydrosol actually is, chemically

A hydrosol, sometimes sold as a floral water, is the aqueous byproduct of steam-distilling a plant, usually for essential oil. When you steam-distill lavender flowers to get lavender essential oil, you also get lavender hydrosol, water that carried trace amounts of water-soluble plant compounds through the distillation process. It's mostly water, but it's not the same as plain water with a fragrance dropped in. It genuinely contains dissolved plant constituents, just at much lower concentration than the essential oil itself.

Why this affects the INCI name

INCI naming reflects that "mostly water plus plant material" reality directly. Rather than a single word, hydrosol names typically combine the base identifier with the plant it came from, following the standard pattern for water-plus-botanical listings. This is different from listing the plant's essential oil, which gets its own distinct INCI name as an oil, and different from a plain botanical extract made through solvent extraction rather than steam distillation.

The practical upshot: you can't just write "rose water" or "lavender water" on your ingredient list and call it done. You need the properly formatted INCI term, and the specific plant name needs to match the species actually used, since different rose or lavender species can carry different INCI listings.

Common hydrosols and how to think about naming them

Common name	What it is	Naming approach
Rose water	Steam-distilled byproduct of rose flower processing	Water/botanical name combination specific to the rose species used
Lavender hydrosol	Steam-distilled byproduct of lavender processing	Water/botanical name combination specific to the lavender species used
Witch hazel water	Distilled or extracted witch hazel liquid	Often listed with its own established INCI term, verify with supplier
Chamomile floral water	Steam-distilled byproduct of chamomile processing	Water/botanical name combination specific to the chamomile species used

Because INCI naming conventions for botanicals depend on correctly identifying the plant species and the exact standardized listing, the right move for any specific hydrosol is to get the INCI name directly from your supplier's documentation or from an INCI naming reference, rather than guessing based on the common market name on the label of the raw material you bought.

Where people get this wrong on a CNF

A few recurring mistakes:

• Listing the common name only. "Rose water" or "chamomile water" isn't an INCI name, and a reviewer or filing system expecting standardized nomenclature will flag it.
• Confusing the hydrosol with the essential oil. They're different materials with different INCI listings even though they come from the same plant and the same distillation run.
• Assuming water content means no concentration needs stating. A hydrosol is still an ingredient with its own line and, where required, its own concentration or concentration range on the filing, it doesn't get folded silently into your "Aqua" line just because it's mostly water.
• Skipping species identification. If your supplier's documentation names the specific botanical species, that's the detail that determines the correct INCI listing, not just the plant's common name.

Getting the paperwork right from the supplier up

The cleanest path is asking your hydrosol or floral water supplier for a certificate of analysis or ingredient data sheet that states the INCI name directly. Reputable suppliers selling into the cosmetic industry, as opposed to purely the aromatherapy or food space, usually have this on hand, since their other cosmetic-industry customers ask for the same thing.

If a supplier can only tell you the plant and the extraction method, that's enough information to look up or confirm the correct INCI term, but it does mean an extra step before you're ready to file.

Cosmetic Comply maps ingredients like this to their correct INCI name and, where one exists, a CAS number, as part of building your filing, so a hydrosol that arrived from your supplier under a pretty marketing name like "rose petal infusion" gets translated into what a CNF actually needs to see.