Very interesting. I know nothing about brewing so I can't comment on the soundness of the experiment, but it's neat anyway.
When I was a kid, the local orchard sold fresh apple cider that was delicious. After a week or so, it would go hard, and I hated it after that. It was always disappointing for me then to pour a tall glass of cider only to have it be hard. I wonder what the alcohol content (if any) was. When does it turn to vinegar?
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