Homemade apple cider vinegar made the traditional way, starting from apple juice, is a two-step process. Both steps are easy to do and the process is completly natural.
First, the freshly pressed apple juice is fermented into hard apple cider using the natural yeasts already present in the juice. The only equipment you will need is an air lock for the fermentation and a hydrometer to determine the potential alcohol content of the finished cider (both are inexpensive and readily available at your local home brew shop).
Once completed, the hard apple cider is then simply exposed to air to convert it into homemade apple cider vinegar as outlined in the Vinegar Making Procedure.
1) Use one gallon (3.8 Liters) of freshly pressed apple juice from your local apple orchard. The juice should be unfiltered, additive free, and non-pasteurized for maximum nutrition and flavor and to allow the natural yeasts in the juice to ferment the sugar to alcohol.
2) Determine the amount of sugar in the apple juice by measuring its specific gravity or density with a simple hydrometer. The more sugar contained in the apple juice, the higher its density.
(Click here for information on a hydrometer and how to use it to determine sugar content.)
Juice made from North American dessert apples will have a specific gravity between 1.040 and 1.050 and if allowed to ferment fully, will result in a hard cider with around 5.5 to 6.5 percent alcohol content.
If, on the off chance you find the apple juice specific gravity less than 1.040, then add some plain old granulated white sugar (sucrose) directly to the juice as follows:
Add 2.25 ounces (67.5 grams) of sugar to raise the specific gravity of one gallon of juice by 5 points (for example from 1.035 to 1.040).
3) Unscrew the top of the one gallon juice container, screw on a fermentation air lock, and allow the container to stand at room temperature for 6 to 8 weeks. The air lock will allow the carbon dioxide gas, produced during the fermentation, to escape while at the same time preventing the oxygen in the air from getting into the cider and interfering with the reaction.
(This homemade apple cider vinegar fermentation equipment can be purchased online at Amazon.com)
4) After 6 to 8 weeks the fermentation will be complete. There will be no more carbon dioxide gas escaping through the air lock and there will be a thick deposit of lees at the bottom of the container.
To make sure all the sugar has been converted to alcohol, check the cider's specific gravity, which should be less than 1.005.
If the reading is still too high, wait another week and test again.
(Click here for information on a hydrometer and how to use it to determine potential alcohol content.)
To compute the alcohol content of the completed apple cider, take a hydrometer reading (using the potential alcohol scale) after fermentation and subtract it from the value you obtained before fermentation.
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