Ouzo alcohol at approximately 38% ABV and above, but not in water. Diluting the spirit causes it to separate creating an emulsion, whose fine droplets scatter the light. This process is called louching, and is also found while preparing absinthe. Similar aperitifs include oghi (from Armenia), mastika from Bulgaria and Macedonia, rakı from Turkey, pastis (France), and arak (from the Levant). Its aniseed flavour is also similar to the anise-flavoured liqueurs of sambuca (Italy) and anís (Spain) and the stronger spirits of absinthe (France and Switzerland). Aguardiente (Colombia), made from sugar cane, is also similar. The Italian drink "Pallini Mistra," named
Ouzo more commonly as "ouzo yeast"—"μαγιά ούζου" in Greek—the term for "yeast" being used by Greeks metaphorically to denote that it serves as the starting point for ouzo production. The "ouzo yeast" is then distilled. After several hours of distillation, a flavored distillate of approximately 80 ABV (% Alcohol By Volume) is produced. The spirit at the beginning of the distillation (heads) and end (tails) is usually removed to avoid light and heavy alcohols and aromatics. The heads and tails are usually mixed and distilled again. The product of this second distillation can be used to produce a different quality ouzo.