In darker versions, malt flavor can optionally include low roasted malt characters (evident as cocoa/chocolate or caramel) and/or aromatic toffee-like, caramel, or biscuit-like characters. Low-level roasted malt astringency is acceptable when balanced with low to medium malt sweetness. Hop flavor is low to medium-high. Hop bitterness is low to medium. These beers can be made using either ale or lager yeast. The addition of rye to a beer can add a spicy or pumpernickel character to the flavor and finish. Color can also be enhanced and may become more red from the use of rye. The ingredient has come into vogue in recent years in everything from stouts to lagers, but is especially popular with craft brewers in India pale ales. To be considered an example of the style, the grain bill should include sufficient rye such that rye character is evident in the beer.