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What temperature is ideal for mashing grains during the all grain brew process?

You want to be mashing anywhere in the range of 146F to 156F. Mashing at lower temperatures yields more readily fermentable short-chain sugars and yields a drier beer. Higher temperature mashes yield beers with higher final gravities and more body. Mashing over 158F tends to yield beers that are overly astringent due to the extraction of harsh tannins from the grain husk at that temperature. If you are in the 152F range, that is a good, all-around temp to reach for.

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