Onycha

Note Profile

Animal

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About

Onycha is the operculum of a marine sea snail, the horny plate the animal uses to close its shell. Muricidae species, mainly Chicoreus ramosus, supply the trade. It is burned as incense and used as a fixative. The smell is animalic and leathery with a salty, mineral, marine edge. It is not pleasant on its own.

Scent Profile

Onycha smells animalic and leathery, close to castoreum. A salty, briny mineral edge runs through it, the smell of the raw shell rather than of clean sea air. Burning it brings out a smoky side with a sharp, medicinal phenolic note. Left unprocessed it can turn sulphurous, close to old, half-fermented seafood. It is not a pleasant smell on its own.

ScentWheel

Breadthbroad

EnvelopeBase · ~30h lasting

Family Amber · Musk · Leather, Elemental, Fresh & Citrus

Read off the wheel, not a label applied to the note.

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Materials That Can Make This Note

Perfumers can make Onycha from this natural extract.

Natural extract Onycha (operculum of Muricidae sea snails)

Smell words come from published sources.

A given perfume with this note may use this material, or something else.

Origin

Animal. The opercula are collected from marine gastropods, chiefly Muricidae, and are still exported from India to Europe for perfume, cosmetics and medicine. A peer-reviewed study in Scientific Reports calls the operculum possibly "the most ancient animal derived aromatic to have an extensive global use". In Arabic it is azfar al-tibb, sweet hoof, and in Latin unguis odoratus. The Babylonian Talmud records the preparation: the shells were rubbed with an alkali made from bitter vetch to remove impurities, then soaked in fermented caper-berry juice or strong white wine to improve the smell. The plate is chitin and chitosan, both odourless. What smells is the marine protein trapped with them and its breakdown after harvest. THE REFERENT IS DISPUTED. One minority reading holds that the onycha of Exodus 30:34 was labdanum, argued on kosher law and etymology rather than on smell. Another reads it as benzoin, and some essential-oil sellers sell Styrax benzoin under the name onycha. This note is scored on the operculum reading.

Usage in Perfumery

Mostly incense rather than alcoholic perfume. Ground opercula go into North African and Middle Eastern bakhoor, Sudanese smoke baths and East Asian incense. There they bind the blend, hold scent molecules down and add depth and a powdery touch. It is a fixative, used for what it does to a blend, not because it smells good alone. One perfume writer ranks it with musk and ambergris for that role. Attested 4 times on Fragrantica and 4 on Parfumo across 4 brands, counting Onycha and Onycha absolute together. Dry distillation of the same shells gives a different product entirely, choya nakh.