Originally By Tony Ackland
Measuring the Alcohol ContentDepending on the reflux ratio of your still, you can produce a product up to 95 % ethanol (190 proof). You can't drink it this strong (remember - ethanol can be poisonous); it needs diluting. Get a spirit hydrometer (or one for wine), measure the % alcohol, and dilute it down to around 40 % (whiskey) or 22 % (liqueurs).
When you use a hydrometer, make sure that the alcohol is at the right temperature. If the alcohol is still warm, it will be "lighter" than at the "standard" temperature (usually 20oC), and thus the hydrometer will sink lower in it, making you think that its got more alcohol in it. Wrong. This is where most of the claims of getting 97% purity etc come from - only 96.5% is possible without using a vacuum still, or by drying the alcohol (even then, if left in an open container, it will suck in moisture from the air and dilute itself back to 96.5%). Most hydrometers come with a chart for making temperature adjustments.
The instructions which came with my hydrometer advise the following corrections to the final specific gravity reading ...
Pilch gives the following advice ...
An Alcometer (as apposed to a Wash, Wine & Beer Hydrometer) is used to test the strength of your spirit. Additives such as flavouring and Liquid Glucose will distort the hydrometer readings. Alcometers should only be used to test spirit in the following conditions:
Husker has included an Interactive Temp Correction Calculator in the Calcs menu. It allows MUCH more accurate detailed information than the above table
Take good care of your Alcometer as it's very fragile. Wash and sterilize with cold water only.
Prior to Carbon Purifying, the spirit should be watered down in strength to 38-40% by volume prior to drinking. It is very important not to make higher strength spirit.
Litres collected x Alcohol strength / Alcohol strength required = Total litres to be made up to. e.g 4.5 litres x 45% / 40% = 5.06 litres.
If you collect 4.5 litres of spirit and this measured 45% after carbon purifying, then multiply 4.5 x 45. Divide this by 40% and you will need to make the total spirit up to 5.06 litres with water. In other words add .56 of a litre of water. This is a rough guide only but a very good one to follow.
Watering down the spirit to 40%, or less is very important as people unused to high strength spirit can easily overdose resulting in Nausea and in extreme cases death.