Re: Checking alcohol levels in beer by means of distillation.
Thousand thanks !
Your explanation is as clear as water and solves all my doubts. Thanks
also for the article about alcohol levels in beer.
Salud from Korea
--- Posted by: "Harry" gnikomson2000@... gnikomson2000
>The methods you use are, as you say, 'basic'. They can only give anapproximate figure as they are derived from the CO2 given off in
fermentation, not actual alcohol.
The gougers (taxmen) require a far more accurate measurement from
actual alcohols, not CO2.
Distilling a 25ml sample and collecting half the sample volume will
collect ALL the alcohol. The refractometer will give a reading in
A/V (alcohol by volume). Because it's ALL the alcohol in HALF the
volume, it's divided by 2 to determine the A/V of the original 25ml
sample. This is an extremely accurate measurement.
Bear in mind also that this method measures ALL the alcohol types
present in your sample, not just the ethanol. Most fermentations
produce other alcohol types, albeit in small quantities. But you
pay tax on them also.
Here's something I dug up a long time ago. Can't remember the
source so apologies for not quoting source...