New answers tagged juice
I'd be very wary of this, if only because it seems to have fermented remarkably quickly. The fizz is likely the result of carbon dioxide being produced by yeast eating the sugars in the grape juice; this is the same process that carbonates beer or sparkling wines. The thing is, most of these yeasts are introduced deliberately, and they take a while to do ...
It's probably safe to drink. If it's fizzy, but doesn't smell bad it's likely a natural grape yeast from the white bloom on the skin of the grapes. Wine makers test their brew by smell and taste and only use chemistry to find out how much a shift of chemistry is predicted to get it to taste the way you want.
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