Varies with base style. A low to moderate wood- or oak-based aroma is usually present. Fresh wood can occasionally impart raw "green" aromatics, although this character should never be too strong. Other optional aromatics include a low to moderate vanilla, caramel, toffee, toast, or cocoa character, as well as any aromatics associated with alcohol previously stored in the wood (if any). Any alcohol character should be smooth and balanced, not hot. Some background oxidation character is optional, and can take on a pleasant, sherry-like character and not be papery or cardboard-like.Varies with base style. Often darker than the unadulterated base beer style, particularly if toasted/charred oak and/or whiskey/bourbon barrels are used.Varies with base style. Wood usually contributes a woody or oaky flavor, which can occasionally take on a raw "green" flavor if new wood is used. Other flavors that may optionally be present include vanilla (from vanillin in the wood,'); caramel, butterscotch, toasted bread or almonds (from toasted wood); coffee, chocolate, cocoa (from charred wood or bourbon casks); and alcohol flavors from other products previously stored in the wood (if any). The wood and/or other cask-derived flavors should be balanced, supportive and noticeable, but should not overpower the base beer style. Occasionally there may be an optional lactic or acetic tartness or Brett funkiness in the beer, but this should not be higher than a background flavor (if present at all). Some background oxidation character is optional, although this should take on a pleasant, sherry-like character and not be papery or cardboard-like.Varies with base style. Often fuller than the unadulterated base beer, and may exhibit additional alcohol warming if wood has previously been in contact with other alcoholic products. Higher alcohol levels should not result in "hot" beers; aged, smooth flavors are most desirable. Wood can also add tannins to the beer, depending on age of the cask. The tannins can lead to additional astringency (which should never be high), or simply a fuller mouthfeel. Tart or acidic characteristics should be low to none.A harmonious blend of the base beer style with characteristics from aging in contact with wood (including any alcoholic products previously in contact with the wood). The best examples will be smooth, flavorful, well-balanced and well-aged. Beers made using either limited wood aging or products that only provide a subtle background character may be entered in the base beer style categories as long as the wood character isn't prominently featured.  A traditional production method that is rarely used by major breweries, and usually only with specialty products. Becoming more popular with modern American craft breweries looking for new, distinctive products. Oak cask and barrels are traditional, although other woods can be used.