Varying strength examples exist (table beers of about 5% strength, typical export beers of about 6.5%, and stronger versions of 8%+). Strong versions (6.5%-9.5%) and darker versions (copper to dark brown/black) should be entered as Belgian Specialty Ales (16E). Sweetness decreases and spice, hop and sour character increases with strength. Herb and spice additions often reflect the indigenous varieties available at the brewery. High carbonation and extreme attenuation (85-95%) helps bring out the many flavors and to increase the perception of a dry finish. All of these beers share somewhat higher levels of acidity than other Belgian styles while the optional sour flavor is often a variable house character of a particular brewery.