Costus Oil, derived from the roots of the Costus plant, is a natural absolute known for its warm, earthy, and slightly sweet aroma. It is often used in perfumery to add depth and complexity to compositions, particularly in oriental and woody fragrances. The oil has a rich, balsamic character that can enhance the overall warmth of a scent, making it a valuable ingredient in base notes. Costus Oil is typically employed in small quantities due to its potent scent profile, and it can be found in various formulations, often combined with other resins, woods, and florals to create a harmonious blend. In terms of safety and regulatory considerations, Costus Oil is subject to IFRA guidelines, and perfumers should be aware of any restrictions that may apply to its use in cosmetic products. As with many natural materials, it is essential to consider potential allergens and sensitivities when formulating with Costus Oil. — AI-generated summary, 2026-09-02.
Intensely animalic and warm, with a heavy fatty-woody character reminiscent of unwashed hair, wet fur, and old wood. Develops a musky, slightly goaty depth with earthy-root undertones that clings persistently. A classic animalic fixative with a divisive, almost dirty signature.AI · claude-opus-4-7
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Perfume and Flavor Materials of Natural Origin, page 136.
Costus Oil is a pale yellow to brownish yellow, very viscous liquid.
The oil does not separate well from the condensed water, partly because of the fact that its specific gravity is almost the same as that of water, partly because of water-solubility of certain components of the oil.
It has a peculiar soft, but extremely tenacious odor, reminiscent of old, precious wood, orris root, fatty (but not rancid) acids, vetiverol, etc., with a distinctly animal or sebaceous undertone.
In surprisingly small concentrations, Costus Oil will induce warm, woody and 'natural' notes to a perfume; however, this is limited to certain perfume types, e.g. Oriental bases, chypres, violet bases, certain floral fragrances, etc., and many types of the 'modern-aldehydic' theme. The oil blends well with alpha-decanolide (various isomers), cinnamic alcohol, flouve oil, isoeugenol, methylionones, decylpropionate, nitromusks, patchouli, opopanax, oakmoss, etc.
Prior to distillation, the roots are not only comminuted, but also macerated in water. The distillation is then a combination of water- and steam-distillation.