These days, Belgian beers are sold in brown- (or sometimes dark green-) tinted glass bottles (to avoid negative effects of light on the beverage) and sealed with a cork, a metal crown cap, or sometimes both. Some beers are bottle conditioned, meaning reseeded with yeast so that an additional fermentation may take place. Different bottle sizes exist: 25 cl, 33 cl, 37.5 cl, 75 cl and multiples of 75. (8, 12, 24 or multiples of 24 fl. oz.) The 37.5 cl size is usually for lambics. Other beers are generally bottled in 25 or 33 cl format (depending on brands). The bigger bottles (75 cl) are sold almost in every food shop but customers do not always have an extensive choice. Bottles larger than 75 cl are named following the terminology used for champagne and are limited in quantity. In Belgian cafés, when someone orders a "demi" (English: "half"), he receives a 50 cl (half liter) glass (with beer from the tap, or from 2 bottles of 25 cl).