Scotch whisky whisky used. An age statement on the bottle, in the form of a number, must reflect the age of the youngest whisky used to produce that product. A whisky with an age statement is known as guaranteed age whisky. Scotch whisky without an age statement may, by law, be as young as three years old. In the early 21st century, such "No age statement" whiskies became more common, as distilleries responded to the depletion of aged stocks caused by improved sales. Labels may also carry various declarations of filtration techniques or final maturation processes. A Scotch whisky labelled as "natural"
Barbera d'Asti has been possible to produce "Barbera d'Asti Superiore", for which the wine must have an alcoholic strength of at least 12.5% by volume, and be aged for at least 14 months, 6 months of which stored in oak or chestnut barrels. Many "superiore" producers refine it in small oak barriques to obtain a rounder taste. The "superiore" has the following sub-zones indicated on the label: "Nizza", "Tinella", or "Colli Astiani" ("Asti"). The "superiore" wine has a strong additional aging potential; it can often be aged from ten to twenty years. The Nizza DOCG was added to Asti's Barbera portfolio in