Sour mash

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Sour mash (or sourmash) is a process used in the distilling industry that uses material from an older batch of mash to adjust the acidity of a new mash. The term can also be used as the name of the type of mash used in such a process, and a bourbon made using this process can be referred to as a sour mash bourbon.^[1]

Sour beer may also be created with this process. Well-known brands of sour mash whiskey are Jim Beam and Jack Daniel's.