Ice beer
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Ice beer involves lowering the temperature of beer until ice crystals form. Since alcohol has a lower freezing point than water and doesn't form crystals, when the ice is filtered off, the alcohol concentration increases. The resulting beer tends to have less character than other beers because the yeast cells/protein particles get filtered off with the ice.
Ice beer is rumoured to have developed by accident in Germany during Oktoberfest celebrations with bock beers which are traditionally brewed in the spring. A particularly cold year froze the beers and a new taste was noticed by the drinkers. These were called Eisbocks. However, in its current form, ice beer was developed from the fruit-juice industry which used to freeze orange juice concentrate in order to reduce shipping costs.th:ไอซ์เบียร์