American-Style Sour Ales are any range of color, and may take on the color of other ingredients. Chill haze, bacteria and yeast-induced haze are allowable at low to medium levels at any temperature. Moderate to intense yet balanced fruity-ester aromas are evident. In darker versions, roasted malt, caramel-like and chocolate-like aromas are subtly present. Diacetyl and DMS aromas should not be perceived. Hop aroma is evident over a full range from low to high. In darker versions, roasted malt, caramel-like and chocolate-like flavors are subtly present. Hop flavor is evident over a full range from low to high. Hop bitterness is evident over a full range from low to high. There is no Brettanomyces character in this style of beer. The evolution of natural acidity develops balanced complexity. The acidity present is usually in the form of lactic, acetic and other organic acids naturally developed with acidified malt in the mash or in fermentation by the use of various microorganisms including certain bacteria and yeasts. Acidic character can be a complex balance of several types of acid and characteristics of age. Moderate to intense yet balanced fruity-ester flavors are evident. Residual flavors that come from liquids previously aged in a barrel such as bourbon or sherry should not be present. Wood vessels may be used during the fermentation and aging process, but wood-derived flavors such as vanillin must not be present. Diacetyl and DMS flavors should not be perceived. Body is evident over a full range from low to high. Fruited versions will exhibit fruit flavors in harmonious balance with other characters. Wood- and barrel-aged sour ales are classified elsewhere.