English term for a well-hopped ale, most often on draught. Although examples vary widely, the name implies a depth of hop bitterness. There is usually some acidity in the finish and colour vanes from bronze to deep copper. Basic bitters usually have an alcohol content of around 3.75-4 percent by volume, "Best" or "Special" bitters come in at 4.4 - 7.5, the odd "Extra Special" at about 5.5.