National symbols of Ireland, the Republic of Ireland and Northern Ireland with Jameson Irish Whiskey and Tullamore Dew the main whiskey brands. Poitín, made from potatoes and with an alcohol content of up to 90% ABV, is the traditional Irish moonshine, brewed illegally since 1661, when a duty was placed on whiskey and other spirits were made illegal. According to one guidebook, ""If you see a product labelled "poteen" in an airport or a bar, it's simply a white duty-paid Irish schnapps. By definition, poteen is illegal and can't be sold."" Stout, a dark beer made using roasted oats or barley, is the national beer, with Guinness heavily promoted as a
Irish whiskey built; the largest pot stills currently in operation in the world (as of 2014), located next door in the New Midleton Distillery, are roughly half this size, at 16,498 gallons (75,000 litres). Though domestic demand would reduce somewhat in the mid-1800s, due to the Temperance movement of the 1830s, and the Great Famine of the 1840s, during which a million died, between 1823 and 1900, whiskey output in Ireland increased fourfold, and with access to the overseas markets provided by the British Empire, Irish whiskey became the most popular spirit in the World, with "Dublin whiskey" being particularly well regarded.