Defined: Extra Special/Strong Bitter (English Pale Ale)

Aroma: Hop aroma moderately-high to moderately-low, and can use any variety of hops although UK hops are most traditional.  Medium to medium-high malt aroma, often with a low to moderately strong caramel component (although this character will be more subtle in paler versions). Medium-low to medium-high fruity esters.  Generally no diacetyl, although very low levels are allowed.   May have light, secondary notes of sulfur and/or alcohol in some examples (optional).

Appearance: Golden to deep copper.  Good to brilliant clarity.  Low to moderate white to off-white head.  A low head is acceptable when carbonation is also low.

Flavor: Medium-high to medium bitterness with supporting malt flavors evident.  Normally has a moderately low to somewhat strong caramelly malt sweetness.  Hop flavor moderate to moderately high (any variety, although earthy, resiny, and/or floral UK hops are most traditional).  Hop bitterness and flavor should be noticeable, but should not totally dominate malt flavors.  May have low levels of secondary malt flavors (e.g., nutty, biscuity) adding complexity.  Moderately-low to high fruity esters.  Optionally may have low amounts of alcohol, and up to a moderate minerally/sulfury flavor.  Medium-dry to dry finish (particularly if sulfate water is used).  Generally no diacetyl, although very low levels are allowed.

Defined: Baltic Porter

Aroma: Rich malty sweetness often containing caramel, toffee, nutty to deep toast, and/or licorice notes.  Complex alcohol and ester profile of moderate strength, and reminiscent of plums, prunes, raisins, cherries or currants, occasionally with a vinous Port-like quality.  Some darker malt character that is deep chocolate, coffee or molasses but never burnt.  No hops.  No sourness.  Very smooth.

Appearance: Dark reddish copper to opaque dark brown (not black).  Thick, persistent tan-colored head.  Clear, although darker versions can be opaque.

Flavor: As with aroma, has a rich malty sweetness with a complex blend of deep malt, dried fruit esters, and alcohol.  Has a prominent yet smooth schwarzbier-like roasted flavor that stops short of burnt.  Mouth-filling and very smooth.  Clean lager character; no diacetyl.  Starts sweet but darker malt flavors quickly dominates and persists through finish.

Defined: Robust Porter

Aroma: Roasty aroma (often with a lightly burnt, black malt character) should be noticeable and may be moderately strong. Optionally may also show some additional malt character in support (grainy, bready, toffee-like, caramelly, chocolate, coffee, rich, and/or sweet).  Hop aroma low to high (US or UK varieties).  Some American versions may be dry-hopped.  Fruity esters are moderate to none.  Diacetyl low to none.

Appearance: Medium brown to very dark brown, often with ruby- or garnet-like highlights.  Can approach black in color.  Clarity may be difficult to discern in such a dark beer, but when not opaque will be clear (particularly when held up to the light).  Full, tan-colored head with moderately good head retention.

Flavor: Moderately strong malt flavor usually features a lightly burnt, black malt character (and sometimes chocolate and/or coffee flavors) with a bit of roasty dryness in the finish.  

Defined: Northern English Brown Ale

Aroma: Light, sweet malt aroma with toffee, nutty and/or caramel notes.  A light but appealing fresh hop aroma (UK varieties) may also be noticed.  A light fruity ester aroma may be evident in these beers, but should not dominate.  Very low to no diacetyl.

Appearance: Dark amber to reddish-brown color.  Clear.  Low to moderate off-white to light tan head.

Flavor: Gentle to moderate malt sweetness, with a nutty, lightly caramelly character and a medium-dry to dry finish.  Malt may also have a toasted, biscuity, or toffee-like character.  Medium to medium-low bitterness.  Malt-hop balance is nearly even, with hop flavor low to none (UK varieties).  Some fruity esters can be present; low diacetyl (especially butterscotch) is optional but acceptable.

Defined: Southern English Brown

Aroma: Malty-sweet, often with a rich, caramel or toffee-like character. Moderately fruity, often with notes of dark fruits such as plums and/or raisins.  Very low to no hop aroma.  No diacetyl.

Appearance: Light to dark brown, and can be almost black.  Nearly opaque, although should be relatively clear if visible.  Low to moderate off-white to tan head.

Flavor: Deep, caramel- or toffee-like malty sweetness on the palate and lasting into the finish.  Hints of biscuit and coffee are common.  May have a moderate dark fruit complexity.  Low hop bitterness.  Hop flavor is low to non-existent.  Little or no perceivable roasty or bitter black malt flavor.  Moderately sweet finish with a smooth, malty aftertaste.  Low to no diacetyl.

Defined: Brown Porter

Aroma: Malt aroma with mild roastiness should be evident, and may have a chocolaty quality.  May also show some non-roasted malt character in support (caramelly, grainy, bready, nutty, toffee-like and/or sweet).  English hop aroma moderate to none.  Fruity esters moderate to none.  Diacetyl low to none.

Appearance: Light brown to dark brown in color, often with ruby highlights when held up to light.  Good clarity, although may approach being opaque.  Moderate off-white to light tan head with good to fair retention.

Flavor: Malt flavor includes a mild to moderate roastiness (frequently with a chocolate character) and often a significant caramel, nutty, and/or toffee character.  May have other secondary flavors such as coffee, licorice, biscuits or toast in support.

Defined: Mild

Aroma: Low to moderate malt aroma, and may have some fruitiness.  The malt expression can take on a wide range of character, which can include caramelly, grainy, toasted, nutty, chocolate, or lightly roasted.  Little to no hop aroma.  Very low to no diacetyl.

Appearance: Copper to dark brown or mahogany color.  A few paler examples (medium amber to light brown) exist. Generally clear, although is traditionally unfiltered.  Low to moderate off-white to tan head.  Retention may be poor due to low carbonation, adjunct use and low gravity.

Flavor: Generally a malty beer, although may have a very wide range of malt- and yeast-based flavors (e.g., malty, sweet, caramel, toffee, toast, nutty, chocolate, coffee, roast, vinous, fruit, licorice, molasses, plum, raisin).  Can finish sweet or dry.  Versions with darker malts may have a dry, roasted finish.  Low to moderate bitterness, enough to provide some balance but not enough to overpower the malt.  Fruity esters moderate to none.  Diacetyl and hop flavor low to none.