...but it's still the same whiskey that went into the barrel.
A used barrel, if used for aging the entire length of maturation will take longer for mellow out the spirit.
One of our smaller batch releases of Old Potrero is "Hotalings Old Potrero"...which is the same liquid from the same still, just put into a previously used Old P barrel. We generally leave those to 11-12 years or more instead of the normal 6-7 years we'd do in a new char barrel.
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I imagine it would affect the taste, but would using a re-used barrel do something chemically to the alcohol that would alter it in some way vs. using a new barrel?
Or is is simply a matter of that's how it's defined?