Description
The Ouzo effect is a spontaneous emulsification of anethole droplets that occurs when ethanol concentration in an aqueous solution falls below a critical threshold.
Technical
Anethole, soluble in ethanol but insoluble in water, nucleates into micron‑scale droplets as the ethanol concentration drops below ~30 % v/v. This nucleation lowers interfacial tension and creates a milky, opaque suspension characteristic of anise‑flavored spirits. The process is driven by the balance of solubility, interfacial tension, and kinetic factors such as agitation and temperature.
Science
Primary Reaction
Spontaneous nucleation of anethole droplets from aqueous ethanol solution as ethanol concentration falls below ~30 % v/v, leading to emulsification
Sensory Profile
Aroma ()
anisesweetherbalspicymintylicorice-likearomaticfreshfloralwarm