Alcoholic drink which contains a very high level of alcohol and "does not contain any added flavoring" is commonly called a neutral spirit. Generally, any distilled alcoholic beverage of 170 US proof or higher is considered to be a neutral spirit. Most yeasts cannot reproduce when the concentration of alcohol is higher than about 18%, so that is the practical limit for the strength of fermented drinks such as wine, beer, and sake. However, some strains of yeast have been developed that can reproduce in solutions of up to 25% ABV. Shot sizes vary significantly from country to country. In the United
Barley wine very distinctive, with an earthy hoppiness, a wineyness, lots of fruit and toffee flavours." He also noted that its original gravity is 1.062. Martyn Cornell was quoted as saying "no historically meaningful difference exists between barley wines and old ales". He later clarified, "I don’t believe there is actually any such meaningful style as 'barley wine'". Barley wines are sometimes labelled with a production date, as they are intended to be aged, sometimes extensively. Many jurisdictions have different taxing schemes for potables based upon alcohol content. Since barley wine has a high alcohol content, it is, in some jurisdictions, taxed