I'd think that the gelatin from the first keg would be jello by now. If it doesn't mix in with the beer, it's not going to do anything.
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I'm also curious about how to make sanitary transfers from the jar to whatever (Erlenmeyer or whatever) you use on your stir plate.
So you can quarts of late runnings or brew day excess at the usual 1.030 to 1.040, then it sits shelf stable until you need it, and just dump it and the yeast right into the starter vessel with no other prep (other than the usual sanitation of the flask)?