Barrel

A 7 gallon oak barrel

Wooden container used to store spirits, normally made of oak though other woods are also used.

Technically, a barrel is a type of cask that holds 36 gallons.

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During the barrel aging process, some of the following chemical changes occur in the spirit:

• The aldehyde level changes
• The color changes
• The concentration of esters changes
• The acidity changes
• The concentration of furfural changes
• The concentration of fusel oils change
• The pH changes
• The amount of solids change
• The proof changes
• The concentration of tannins change
• The total acidity changes