Shalom Shachne <
shalom...@gmail.com> wrote in news:945a93e6-c2d4-4cb4-8a91-
26292e...@h5g2000vbx.googlegroups.com:
> I bottled my first batch of wine, which was made from home grown
> Concord grapes. The wine had been aging in a class carboy in my
> basement for 2 years. (Not sure whether letting it sit longer helps,
> but according to the "Vines to Wines" book, he says it ages better in
> bulk than in individual bottles).
>
> Anyway, I sweetened about 1/2 the batch with Concord grape juice, and
> then bottled.
Oops.
>I was surprised to see corks popping out after a few
> weeks, and also tasting one of the bottles, it seems like it became a
> fizzy wine.
Doesn't surprise me. You're lucky the corks popped before the bottles exploded.
>
> I thought that once the wine reached full alchoholic level, all the
> yeast died?
Fermentation stops when EITHER of two things happens: the alcohol level becomes high
enough to kill the yeast, or there is no sugar left to ferment.
Most fermentations stop for the latter reason, not the former -- and, as you have discovered,
if additional sugar is introduced, the yeast will be happy to ferment it for you.
> I guess also, based on what I just read, you have to add
> Sorbate when bottling to prevent this?
Yes. NEVER sweeten a wine without adding sorbate at the same time.