BENZOIN

Benzoin is a natural balsamic resin, the hardened exudate collected by wounding the bark of Styrax trees, most commonly Styrax tonkinensis (Siam benzoin) and Styrax benzoin (Sumatra benzoin); several CAS numbers exist because these regional resin sources are chemically and commercially distinct rather than a single defined substance, so no single CAS is truly definitive for "benzoin" as a category. In perfumery the raw resin is rarely used directly — it is typically dissolved and processed into a resinoid (often cut in a solvent such as benzyl benzoate or DPG for workable viscosity) or, less often, an absolute. Siam benzoin tends toward a softer, sweeter, vanilla-like and creamy balsamic character, while Sumatra benzoin leans slightly darker, drier and more smoky-phenolic. Olfactively it reads as warm, sweet, powdery-vanillic and resinous, with honeyed and faintly spicy undertones. It is used almost exclusively as a base-note material, prized as a fixative that slows evaporation and rounds out sharper top and heart notes; typical dosage is low, often well under a few percent of a formula. It anchors oriental, amber, gourmand and incense-type accords, and pairs naturally with vanilla, labdanum, tonka, and other balsamic or resinous materials. Because natural benzoin resinoids contain constituents like benzyl benzoate and cinnamic derivatives, they carry some recognized skin-sensitization potential, so use levels are generally kept conservative and monitored under industry safety guidance rather than left unrestricted. — researched, 2026-09-02.