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Definition: Pasteurization is a process of heating beer, and many other consumable products, to a temperature that will kill any living microbes without changing the chemistry or flavor. It is used by some brewers to sterilize and stabilize their product.

When pasteurization was first introduced to the brewing industry in the late 19th century, it was revolutionary. Beer had a tendency to spoil back then when refrigeration was uncommon and the chances of infections in packaged beer was greater. These days some folks in the beer community decry the practice. Beer and the yeast still present in it after fermentation is a living thing, they say, and should be enjoyed as such.

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