Ah, figured it was that way. I've used dry ice to carbonate random things, but I wasn't sure it'd be all that useful for what you were wanting or not; never tried, just with Italian soda mixes and such. Iirc, there's a chemical method, but I don't know if it wouldn't do truly strange things to the taste of whatever you were using it on.
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This is actually what they do with poorly-carbonating sparkling wines. But they usually use overly sweet, not oaky, aged wine. ^-^
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Mew.