What went into the Cider? Also, are you certain no one else touched or moved it? Once Yeast and sediment flocculate, they really only get resuspended by physical motion. I would imagine if the temperature had swung wildly it could cause a dormant ferment to reinvigorate...but that sounds like it is not the case. I am stumped.
The thing about infection is that it happens a lot earlier on than is indicated by sight...and pretty much with normal Cider it is usually the Acetobacter that move in after the ferment if you are going to get 'infected'. If you smell it you'll know it. A Pellicle will form eventually and you should get 'ropes'. Now that I think about it....my Cider Vinegar is about half way done and is indeed cloudy, but I never payed strict attention to the phases it went through to get there. Not to alarm you buy you may be on your way to Vinegar. How long has it been fermenting and what was the recipe?
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Event Horizon ~ A tribute to the miracle of fermentation.
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