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Old cider or vinegar barrels,
if sound, are preferred to new ones, but if new they are washed with scalding water; boiling vinegar is next poured in and the bung closed and the barrel allowed to stand until its sides become thoroughly saturated with the vinegar. This requires from 1 to 3 days, according to the material of which the barrel is made. After this preparation it is filled about one-third with strong and pure cider vinegar and 2 gallons of cider. Every eighth day thereafter, 2 gallons of cider are added until the barrel is
two-thirds full. In 14 days after the last two gallons are added the whole will have turned into vinegar; one-half of which is drawn off and the process of filling with cider begun again. In summer the oxygenation will go on in the sun, but in cool weather the liquid is kept where the heat can be maintained at about 80 degrees. By this process it takes a little more than two months to produce vinegar. "
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