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  1. #121
    Join Date
    Mar 2000
    Midland, MI

    Re: barrel programs...can I buy and age my own bar

    > The received wisdom is that hot whiskey expands into the wood, then when
    > it cools it contracts, coming back into the barrel with lots of wood goodies
    > for all the little whiskeys that didn't get to go into the wood.

    I've heard that story, too, but I've seen absolutely nothing in the
    technical literature to support it.

    Studies of whiskey aged at constant temperature show that all the same
    processes are happening, and all the same goodies turn up, just like in
    "real", warehouse aged, variable temperature whiskey.

    Piggott's book cites a Scotch study (Duncan and Philip J. Sci. Food
    and Agric. 1966 17:208-214) showing that barrels that in a room with
    fluctuating temperature and humidity were no different than barrels
    at constant temperature and humidity, other than a small change
    in proof. Storage temperature (fluctuating or not) had a huge effect
    on all the non-volatile components of the whisky.

    George Reazin of Joseph E. Seagram and Sons, Louisville, KY, published
    a paper called "Chemical mechanisms of whiskey maturation" (Am. J. Enol.
    Vitic. 1981 32:4 283-289) that doesn't even mention temperature variation!
    Toward the end, he says "...it appears that temperature merely determines
    the rate at which the various physical and chemical reactions proceed. It
    should be pointed out that, although the various reactions occurring
    during maturation can be increased with temperature, there does exist
    an optimum temperature to produce the desired product quality. This is
    because the organoleptic impact differs for each of the congeners. Thus,
    as the temperature increases, the relative amounts of congeners present
    change causing differences in the product quality."

    > Is what you're saying that the whiskey isn't going to get any further
    > into the wood no matter how hot it gets and it isn't withdrawing from
    > the wood no matter how cold it gets.

    Wood might be able to soak up more whiskey at higher temperature. I dunno.
    You're still losing the angel's share at lower temperatures, so the whiskey
    hasn't left the wood entirely! It's still going into the wood from the
    inside of the barrel and exiting the wood on the outside! I guess the
    rate will really slow down at really low temperatures, but I'd say the
    wood never truly dries out.

    I can accept that wood has more whiskey in it when it's hot and
    less in it when it's cold, but the whole pulls-the-sugars-out-as-it-recedes
    thing just doesn't jive with me. And the data don't support it at all.

    > The variables are time in wood and average temperature, as the solvents
    > become more effective the hotter it gets.

    Time, temperature, and proof are the big variables. And the condition of
    the barrel, of course (i.e. level of char, seasoning of the wood, &c.).
    The chemistry of aging is much more complex and exciting than just being
    a better solvent at higher temperature... the whiskey is acutally undergoing
    chemical reactions with the wood. The wood is degrading... large, insoluble
    molecules are broken down into smaller, soluble molecules. All kinds of
    other stuff, too.

    A lot of people say "average temperature", but I'd like to stay away from
    that term... if you burn the turkey, you can stick it in the freezer for a
    week in order to lower the "average temperature", but you've still burned
    the turkey! There's not really a great term for it other than "time at
    temperature", i.e. some time at high temperature and some time at low

    I've noticed that the recieved wisdom is that, with heated warehouses,
    you can get "an extra season" by heating during the winter. Why just
    one? Why not heat up for the first two weeks of December and the last
    two weeks of January? Wouldn't that give you two summers worth of cycling?
    Why not go to three or four? You could age twelve years worth in three
    calendar years!

    I think that if cycling has any effect, the real effect is in oxidation...
    if you take a barrel and bring it up to the top of the warehouse, it'll
    hiss and whease... the air inside has heated up, therefore built up
    pressure. Daily and/or seasonal variation might create pressure/vacuum
    in the barrel that might puch out or draw in air. Or maybe not... maybe
    the barrels are tight enough that water/ethanol/etc will evaporate to make
    up the pressure difference.

    If you talk to the beekeepers, they put the hives in the sun. That way,
    the bees wake up earlier in the morning, and get more warm time to get
    things done. Whiskey's probably the same way. Put it in an iron-clad
    warehouse so it can warm up and wake up in the morning, and it'll get more
    done that day.

    Tim Dellinger

  2. #122
    Bourbonian of the Year 2011
    Join Date
    Sep 2002
    Toronto, Canada

    Re: barrel programs...can I buy and age my own bar

    Tim, there is no question that increased heat accelerates whiskey maturation. E.g. it is known and accepted by all (I think) that American whiskey matures faster than Scotch because the U.S. climate is warmer where whiskey is matured than in Scotland. In the 1885 Fleischman book the author states that warehouses generally were heated to a uniform 90% F. for the 3 year bonding period. He does not refer to cycling, which would tend to support what you are saying. But you also said there is likely more whiskey in the wood in warm temperatures than cold. This must mean does it not that in a naturally aged product, some of the whiskey in the wood that does not evaporate re-enters the barrel, or rather, more of it than would occur with a uniform-heated product? And if that is so, do you not have more "sweet" whisky continually over the years being affected by the wood gums? And if so, would this not tend to increase product quality? Think of dipping an apple in caramel, or perhaps the basting process in roasting is a better example. This might be a slower maturation process than where the product is held at a uniform temperature but I suspect a better one. Some whiskey aged in cycled warehouses has a "hot wood" taste, e.g., the 2004 Birthday Bourbon does, to my palate anyway. I am not saying batching large amounts of whiskey does not do away with any such effects but in a single barrel you can see it. In fact I wonder if this artificial cycling is not cycling at all but close to what Fleischman describes, i.e., simply keeping the warehouse as hot in the cooler seasons as it is in the hotter seasons, keeping it uniform that is.




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