I found the following information:
" ... don't go out and buy commercial wine to top up your carboy (it will probably contaminate it anyway) ... "
Is this true, will commercial wine contaminate ?????
(I apologize if this has already been discussed.)
After doing this on a a number of wines, I'd say there's no problem - in fact it's a lot better than the alternatives of adding water or leaving too much head space. Your other options are to add sterilized marbles (a bit of a pain, but workable if you're topping up a wine that's hard to match, like an ice wine), or rack into a smaller container.
Ed
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