Whisky Adventures

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Whisky Adventures

Here you will find all interesting things I come across in the world of Scotch Whisky as I travel and spread the wit and wisdom over a dram or two...

  • Maturing Whisky: A Graphical View


    As an astrophysicist, I have a great love for graphs. I’d go so far as to say I have a favourite graph. My favourite graph has nothing to do with physics. It does however have everything to do with maturing Whisky.

    6 years ago when I was well into my tenure as distillery tour guide at Glenkinchie, I was shown a graph explaining maturation. This is something that I have referenced throughout my career and something I’d like to share as I publish info regarding oak and it’s uses.

    As with all good scientific graphs it has two axes, and time travels along the bottom. Up the side we have character. Heaviness of character rates from light breakfast whiskies (Glenkinchie and Glenmorangie for example) up to big heavy whiskies (Mortlach and Macallan) all the way through to the peaty monsters (Lagvulin and Ardbeg).

    On the graph we have 3 lines. First of we have distillery character. This is the constant horizontal line. This never changes. The characters given to the spirit by the shape of the still and the other distillery nuances in process are always there. Casks will not remove this character, but they can mask it and balance it, but it does stay constant.

    You also have certain aroma and flavour compounds in spirit that we as humans do not enjoy. Solvent notes, for example nail varnish remover as well as sulphur. These are removed over time, this is the dissipation of immaturity though evaporation and reaction within a cask.

    Finally we factor in the additive influence of oak. Colour, wood sugars, tannin and vanillin all influence the final product. If left in contact for too long though we can create a pretty woody and over balanced dram.


    These three lines give a distiller a window of opportunity. Bottle too early and immaturity can take hold, wait too long and a woody Whisky emerges. Balance is key and can be delivered with the right wood policy for the right Whisky.

    Super peaty drams take longer to reach balance. Lagavulin at 16 years is as balanced as Glenkinchie at 12. Lagavulin’s distillery line is higher than Glenkinchie’s.  

    First fill casks will have steeper maturity lines than refill casks.  Maturity lines get shallower as casks are refilled over and over to the point that they flat line and become exhausted.

    Basically, no matter what cask is used, a master blender wants to bottle when immaturity is undetectable in a whisky, and before the Maturity line encompasses the distillery line rendering the distillery character unrecognisable.  This is the reason that many older whiskies are racked in refill casks.  It also explains the recent trend for non age-statement whiskies being full of flavour as they are matured in first fill and even virgin casks.

    The trick is to bottle before the brown line overtakes the blue one.  At this point, everything tastes like oak.

    Hope this sheds some light on the situation.  Older is not always better, it’s all about wood policy and final objectives.

    Cheers,
    Craig


    In my glass: Talisker 10  A whisky that was bottled young despite it’s massive distillery character.  Perfect balance is not and should not always be the end goal.  Talisker is unbalanced towards the distillery so the peat punches you in the face!  The antithesis of this would be an older Macallan, overbalanced towards the oak, but even at 60+ years old, the distillery character is detectable.

    Tagged: Scotch Whisky Single Malt Casks Maturation Oak Talisker

    Posted on November 24, 2011

  • Definitions: Cask Sizes

    File:Latin dictionary.jpg
    In the last post we looked at how the Scotch Whisky Industry formed without oak and how this style was available legally as Whisky until as late as 1915.  Now we are going to delve into the depths of maturation, focussing on the cask’s previous contents (this will give you a new outlook on where the flavours come from) as well as the different types of oak and even different cask sizes and their effects.  Not to mention the unquestionable skill and craftsmanship of the cooper.

    I’d like to draw on all of my experiences over the last 8 years and finally give an explanation of what is happening in a cask as far as we can tell at the moment.  It’s a complicated business, one that most people pay lip service to, but one that is brushed over despite it’s vital importance, especially when you realise that without it we would not have Whisky as it exists today.  Hold on to your hats, and jump into casks!

    The first topics I’d like to tackle are the different cask sizes, where they come from and the effect of maturation on each, regardless of the previous contents that were seasoning the casks. Scotch Whisky must mature in Oak in Scotland for a minimum of 3 years and a day, and it must be matured in a cask no greater than 700 litres in size to ensure sufficient wood contact.


    Cask Sizes in use today:

    Gorda 700 litres: A cask used for marrying American whiskies, legally the largest capacity cask we can use for maturation

    Madeira Drum 650 litres: Very uncommon in the Scotch Industry but used from time to time, mainly for aceing and finishing.

    Sherry Butt 500 litres: A cask traditionally used for maturing and fermenting Sherry

    Port Pipe 500 litres: A cask traditionally used for ageing Port, taller and thinner than a Butt

    Puncheon 500 litres: A cask constructed from spare staves, shorter and fatter than a butt

    Hogshead 250 litres: A cask size introduced to make warehouse mathematics easier

    French barrique 225 litres: A cask used for maturing wine

    Quarter Cask 80 litres: A small cask recently re-introduced into the industry to age whisky ‘quicker’

    Bloodtub 50 litres: A tiny cask rarely used these days used


    (All cask sizes are approximate.  Remember that these are hand crafted vessels and can vary from cooperage to cooperage.  This is why all casks are weighed before and after filling to ensure exact content knowledge)

    The first casks used in Scotland would have undoubtedly been small.  Bloodtubs and Quarter Casks would have been kept in the cellars of the wealthy and filled with the local Whisky.  These casks would be tapped half way up and refilled with new spirit (legally Whisky at the time remember) in a crude solera ageing system.  The rich would have been amongst the first to experience the effect of oak on spirit and would have been extremely proud of the unique product ageing in each of their cellars.  This was not done on a grand scale though, as people filled only what they could afford and cooperage was expensive.

    The first cask sizes used on any great scale, would have been standards in the European wine industry.  The first people to have wood policies as such in Scotland would have been the blenders.  Distilleries would have been storing Whisky before the first blends in the 1850s, but even these products were stored to be sold at the greengrocers. These are the greengrocers who would eventually go on to become the blenders.  A perfect circle and a fact that allows us insight into how the industry at the time was shaping up and exactly where the roots of today’s business were planted.  These gentlemen were extremely important, many of them went on to become barons and landowners due to their entrepreneurship and innovation!

    Sherry Butt in construction

    They learned the art of blending from the tea trade, and were in an extremely privileged position when it came to ageing Whisky, as they were also the bottler’s of the time.  This meant they imported casks of French wine, ports, Madeiras and Sherries which they blended and bottled themselves.  It was only natural then that they sold these empty casks to the whisky industry for storing Whisky that they would then buy back.

    So the first casks used on an industrial scale would have been Sherry butts, Port Pipes and French barriques.  When the law changed in 1915 outlawing unaged whiskies, the distilleries jumped at the chance of buying second hand casks from the blenders and greengrocers probably without realising the importance or indeed the legacy laid down which still emanates through the Industry today.

    French barriques however threw up an unusual problem.  One which continued as we went on to source barrels fron the Bourbon Industry in the USA.  The warehousemen of the late 19th and early 20th century were not the most literate of workforces and the guagers were rarely sober.  To switch between 180 or 195 litre casks and 500 litre casks was not the easiest mathematical task in the world for either profession.   Something had to be done.

    French Barriques being disgorged at Bruichladdich

    This was the reason that the industry introduced a Hogshead (a traditional 15th century measurement) into the mix.  It simply made the mathematics of the day easier.  Coopers would bring in three or four barriques or barrels and build two 250 litre hogsheads to make stock-take easier.

    Today the most common size of cask in the Whisky industry is undoubtedly the American Standard Barrel.  These can only be used once by law to mature Bourbon and therefore offer an extremely cheap source of oak for our industry.

    American Standard Barrel

    Today distilleries are rarely building hogsheads, (a process making even more sense when casks were shipped in flat pack form) as it is now cheaper to ship casks whole.  Factor in that the smaller a cask, the larger the percentage of the Whisky inside is in contact with the wood at any giving time, therefore the quicker the Whisky picks up the characteristics from the oak as well a the introduction of computers into the stock system and it makes perfect sense to use American standard barrels.

    The final thing I should point out about casks is their finite lifespan. Casks contain lot of compounds and goodness that we look for in our Whisky (more on the specifics later) however they will lose these benefits as they get older and the Whisky leeches them out.


    I like to think of a cask like a teabag.  If I made myself a cup of tea and then you used the same teabag for your cup of tea, yours would be lighter in colour and less pungent in taste and aroma unless you left the teabag in longer.  Casks work the same.  Each fill will remove more from the wood eventually rendering it exhausted. Subsequent fills will require longer and longer periods to gain significant flavours and most refills will never match up to the colour or aroma of a previous incumbent.  The life of a cask looks like this:

    A trail of tannins from European Oak stacks

    Virgin oak is filled with Sherry/Bourbon/Wine for 1-8 years.  These products remove lots of colour and woody aromas from the cask.

    These casks are then filled with Scotch.  What we now call a first fill cask.  The Scotch removes more aromas and flavours during it’s life in here.  Around 12 years.

    The cask then becomes a refill where we put another batch of Scotch in.  This batch will be lighter and less woody in flavour but can stay in the cask much longer if need be.  Up to 40 or 50 years in special cases.

    If the wood still has more to give a third fill may take place, but this is less common these days.

    The cask can then become a marrying tun for resting blends and marriages of single malts, or if no longer watertight we can make garden furniture or woodchips out of the casks.

    Some companies today still use casks up to 6 or 8 times.  However, gladly the industry is realising that after 3 fill maximum a cask will have very little left to give and we are seeing more and more Whisky makers refuse to use casks more than three times.  These casks will still be in our industry for over 60 years, Oak really is the most important part of our final product and the more us drinkers know about it the better our Whisky Adventures will become.

    Next time we will focus on types of oak and their special properties.


    Cheers,
    Craig




    In my glass: PC9 a perfect marriage of different wine casked whiskies from Bruichladdich to give a superbly married and well balanced peaty monster.



    Tagged: Pipe Bourbon Scotch Butt Bruichladdich Whisky Sherry Quarter Cask Casks Port Wine Barrique Definition Puncheon Hogshead Oak

    Posted on November 22, 2011 with 1 note

  • Are You Aware of What Goes Into Your Bottle of Whisky?

    There’s a big tenth anniversary happening tomorrow the likes of which cannot be ignored.  It’s an event that will be of historical interest to most people who find themselves on this page, yet it’s one which most people get by in their day to day lives not really thinking about.




    Of course I am talking about Bruichladdich bottling their first ten year old since re-openning their gates back in 2001.

    The resurrection of the Laddie is a fantastic tale of hard work, perseverance, determination, blood, sweat and tears and can be recounted in the brilliant book by Stuart Rivans, Whisky Dream: Waking a Giant. A must read for any fans of Scotch Whisky.

    It is not this story I would like to tell today, because as I mentioned, it has already been told quite superbly.  It is one I may revisit in future posts though.  What I would like to share on the eve of the Bruichladdich 10, is the story of exactly what goes into a bottle of whisky… a story we all (including myself up until last week) think that we appreciate.

    I have just come back from a week of working on Islay.  A Whisky Adventure like no other.  I was invited out to work at Bruichladdich for 4 days, with a day off in the middle to work at Ardbeg.  A privilege it was impossible to turn down and one which made me appreciate even more the effort which goes into a bottle of our favourite tipple.

    Here’s what we know from various distillery tours:

    To call a whisky a Single Malt Scotch Whisky it must,

    1. Be made from malted barley, water and yeast and be fermented with natural enzymes from the barley, no sugar can be added to the mixture
    2. It must be distilled in copper pot stills
    3. It must be distilled in Scotland
    4. It must be matured in Scotland, in oak for a minimum 3 years
    5. It must be a minimum 40%abv 
    6. It must be the product of one distillery
    Now what?


    You Malt It:

    Barley is brought into a maltings where it is dressed, steeped, germinated and kilned to a distillery’s specifications before being transported to the distillery.  We tend to forget the farmers who have to grow the barley to a specific standard, and then sell it to the industry.  (Bruichladdich have actually convinced Islay farmers to grow barley on the island for them, this accounts for upwards of 40% of their yield per annum, and has led to a change in rural landscape on Islay.)

    You Mill It:

    The mashman then mills the barley to a specific grind to ensure he gets the most out of his crop.

    You Mash It:

    This grist is then mixed with water at a very specific strike temperature (generally 63.5C) to kick-start starch conversion into soluble sugars.

    You Ferment It:

    The Worts (Useless Information Alert!: short for worthy liquids) are then drained off through an underback, cooled and fed into a washback ready for the addition of yeast to start fermentation.  The final waters are recycled and used in the next batch.  We miss the use of the excess heat from the cooling process being reused to heat the waters for the next batches.  Bowmore even use this heat, as well as heat from other parts of the process for kilning!

    You Distil It:

    After a few days fermentation, our yeast is spent.  The high alcohol beer (7-10%abv) is then ready for distillation.  Distillation happens at least twice at Scottish malt whisky distilleries and is used to concentrate the alcohol level to upwards of 70%abv.  We don’t get told that the stillman knows which dials are wrong, and which stills generally misbehave.  We also never see the fact that a hot still is emptied as a second one is filled, this ensures that the wash is heated and takes less energy to boil. Engineering ingenuity at its best!



    You Cut It:

    After distillation, the spirit is cut into the foreshots, heart and feints.  This is a process targeting certain aromas in the spirit.  It can be measured using hydrometers.  These hydrometers are calibrated to 20C, any fluctuation in temperature means we need to cut at different points.  Of course, the feints and foreshots are recycled in the next batch.

    (I must admit, even here, I’ve skimmed over on a lot of detail.  This was a recap on what we all knew already.  I can go into more detail on these processes, should I get requests for them.)

    You Mature It:

    This spirit is then pumped to the warehouse to be filled, and now the hard work takes on a whole new level!


    Most of us are well aware that the Scotch Whisky Industry uses second hand casks for most of its production.  This was traditionally a money saving technique, but is also seen as vital to achieving a certain balance in our whiskies.  I like to think of casks like teabags, every cup of tea made with a single teabag becomes gradually weaker in strength of flavour and colour, the same goes for casks.  Every refill gives less to the whisky.  Casks therefore are the most important component in whisky as we know it today.  We need to use one for at least 3 years to even label our spirit Scotch!

    The question is, how much do you know about our oak?

    3 years ago I was invited to Jerez in Spain to learn all about oak, and even got the chance to build a sherry butt with a team of my Whisky peers.  This was an eye opening and humbling experience, and still did not cover the whole story!

    An oak cask starts it’s life centuries before we even put whisky into it as an acorn.  It then grows straight and true in the forests of Europe, America and Japan before being felled to be honourably coopered into  vessel for holding whisk(e)y.


    1. The cask I helped to make had been felled in the north of Spain.  
    2. Here it was cut into staves (you get a maximum 2 sherry butts from an oak tree in Spain).  
    3. These staves were then shipped to Jerez in the south 
    4. They were laid to dry in the Spanish sun for 4 years
    5. Then they were coopered into 500 litre sherry butts by 2 Spanish coopers or 6 random whisky geeks
              


    Coopering involved many stages , including cutting, assembling, adding hoops, wetting, toasting, shaping, adding the ends and testing for pressure and water-tightness.

    These casks are then filled with wine for a minimum 2 years and we ship 500 litres of Spanish fresh air up to Scotland to fill whisky into.  This is similar to the process undertaken by the American and French coopers these days too.

    Got the story?  I thought I had too… 

    It wasn’t until 8:30am on Islay, half-way through breakfast with an ever so slight hangover that I realised I had no idea!  Jim McEwen came in, threw some safety gloves at us and told us to get up to the filling store.  240 bourbon barrels had arrived and we, along with the entire Bruichalddich team were there to get them off-loaded and stacked (4 high, 3 without a forklift) so that the lorry could make the next ferry back to the mainland.

    What a workout.  Already a new level of appreciation for the labour in my bottle.  Could it get any higher?

    Of course.  We learned at Ardbeg and Bruichladdich that a full bourbon barrel weighs around a quarter of a tonne.  And we also learned that shifting them was fun, if there was less than 5 of them!  We had to roll these monstrosities onto a loader and turn them with brute force, before spinning them so that when they enetered the rack (9 levels up in the warehouse) they landed bung up…


    Only NOW can you leave them to mature for your minimum 3 years.


    After maturation in the Bruichladdich warehouses the casks are then disgorged into a tank before being put back into cask for a further marrying period of at least 6 months.  

    They are then  disgorged again before being tankered to the in-house bottling line where they can be bottled, labelled, boxed and shipped out.

    See that limited edition Bruichladdich sitting on your shelf?  The label was probably put on by hand.  It may not have appreciated in value on ebay, but hopefully this article will have raised its worth in your eyes and of course in your mouth.

    So lets all raise a glass to the Progressive Hebridean Distillers!

    Slainte

    Craig


    p.s. didn’t mention chill filtration or spirit caramel, because Bruichladdich don’t use those techniques…


    In my glass: Bruichladdich Sherry Classic




    Tagged: Bruichladdich Distillery Whisky Whisky Tasting Casks Islay Training Jerez

    Posted on September 10, 2011

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