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Posted

a few years ago I went round a distillery and one of the things they showed us was a 100 year old barrel of whisky but it was only half full due to evaporation when I asked how they got the alcohol levels back up he gave me a load of waffle and did not answer the question

Posted
a few years ago I went round a distillery and one of the things they showed us was a 100 year old barrel of whisky but it was only half full due to evaporation when I asked how they got the alcohol levels back up he gave me a load of waffle and did not answer the question

 

 

Why had the level of alcohol dropped?

The evaporation is the Angels share!

Posted (edited)

Cask loses approx 1% ABV and 2% volume per year, does vary though.

 

Barrels are emptied 100%, the liquid left in scrap barrels is whisky that's been absorbed by the wood and then leaches back out over time, also water which gets into empty barrels lying around

 

If ABV drops below 40% in cask then that's a major cockup but can be brought up back up by marrying in younger cask (higher ABV) when they bottle it.

 

Edit: these days most distilleries fill at something like 64%, they fill at same ABV to make it easier for trading casks for blending

Edited by Wood wasp
  • 7 months later...

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