Originally posted by sarraceniac
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If the brew is still fermenting in the bottles, initially this produces a 'sparkle', if it continues it leads to explosions.
If there is any sweetness left, then the only reason for it to have stopped fermenting is that the yeast present is not tolerant of any more alcohol. Wild yeast may very well have a very low alcohol tolerance (perhaps as low as 4% or less?). 'Bought' yeast will ferment out the sugar until either there is no sugar left, or the alcohol level is too much for that particular yeast, anything from about 7% to 14% depending on exactly what sort of yeast you have.
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