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- This method measures the alcohol content by volume of any wine,spirit,or beer,using a hydrometer, giving readings as accurate as an ebulliometer used by commercial wineries. The method is based on the research of Dr. William Honneyman,Ph.D."
- 1.Measure the SG of the wine you wish to test.We will call this figure SG-1.
- 2.Measure exactly one pint of the wine (500ml).We will call this the sample.
- 3.In a enamelled or glass pan,boil the sample down to about half it's original volume.This drives off some of the water,but all of the alcohol,because alcohol boils at a lower temperature than water.The sample now consists of water,residual sugar,colouring matter,acids and proteins-that is,all the non-alcoholic constituents of the wine.
- 4.With distilled water or rain water,make the boiled-down sample up to exactly a pint again.Tap water is not recommended because,in some areas,it has a considerable dissolved mineral content which could affect your results.
- 5.Cool the sample down to 60o-F, or what ever temperature your hydrometer is calibrated for.
- 6.Read the SG of the sample,we will call this reading SG-2.You will find it higher than SG-1 because you have removed the alcohol and replaced it with water.
- 7.Subtract SG-1 from SG-2. The difference is called the Spirit Indication.
- 8.Read the alcohol strength from the following table.
- Spirit Indication---- Alcohol Strength,% by volume
- 1.5 ----------------------- 1,0
- 2-------------------------- 3.4
- 6-------------------------- 4.1
- 7-------------------------- 4.9
- 8-------------------------- 5.6
- 9-------------------------- 6.4
- 10------------------------- 7.2
- 11------------------------- 8.0
- 12------------------------- 8.8
- 13------------------------- 9.7
- 14------------------------- 10.5
- 15------------------------- 11.4
- 16------------------------- 12.3
- 17------------------------- 13.2
- 18------------------------- 14.1
- 19------------------------- 15.1
- 20------------------------- 16.0
- 21------------------------- 17.0
- 22------------------------- 18.0
- 23------------------------- 19.0
- 24------------------------- 20.0
- 25------------------------- 21.0
- 26------------------------- 22.0
- As an example:
- SG-1 (SG of oraginal wine) = 0.995
- SG-2 (SG of sample at stage 6) =1.011
- Spirit Indication= 1.011 - 0.995 = 16
- Alcohol strength= 12.3 % by volume.
- Buy a short range hydrometer, reading from 0.990 to 1.020. This should let you read SG to half a degree.You can then work out a spirit indication to half a unit and by interpolation on the table reach a closer value for alcohol strength.
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