Unfiltered

Definition Unfiltered whisky is whisky that does not undergo cold filtration (chill filtration) before bottling. This often corresponds to the designation non-chill filtered (NCF) and means that a larger amount of natural components is preserved, including oils, esters and certain proteins, which can affect body, aroma and color.

Process and implications Chill filtration removes viscous components and impurities by cooling, which yields a clearer drink and less tendency to become cloudy when diluted. Unfiltered production avoids this treatment and therefore preserves more natural compounds that contribute to mouthfeel and aroma profile. The differences are often most pronounced with whiskies that have been aged longer or produced in warm climates.

Flavor, body and texture More oils and texture are preserved in unfiltered whisky, which often gives a fuller mouthfeel and more complex notes of malt, caramelization, fruit and spice, as well as a longer finish. Some consumers find that the drink can be more sensitive to chilling and dilution, which can lead to temporary cloudiness or altered aroma profile when chilled.

Color and clarity Unfiltered whisky can have a deeper color, as certain colorants are not removed during filtration. When chilled, it can however form cloudiness (chill haze) in some cases, which normally does not occur at ordinary room temperature.

Practical considerations - NCF/unfiltered often means that the whisky retains more of its natural character and can be somewhat more sensitive to heat and air. - The alcohol by volume typically ranges around 40–46% ABV, but variation is greater between brands. - When consumed, added water or ice can cause the aroma and flavor experience to change more markedly than in filtered variants.