Hello. When I brewed the 5-gallon Ferocious IPA (extract recipe), I put one full packet of Fermentis Safale S-04 dry yeast. The recipe came with two packets, but I didn't use the second. I did a secondary fermentation (slow, but still some CO2 activity, but did not add any more yeast. After this conditioning, I bottled the beer into growlers after adding the priming solution sugar. After a few weeks in the bottle, the IPA is pretty good. Taste is OK (not hoppy enough for me), with alcohol level ~ 6% based on the specific gravity readings. But I'm considering an experiment wherein I take 1 gallon of this finished beer (some that has not been refrigerated) and add new dry yeast to see if any additional fermentation occurs. Is there any value to this? Any comments would be welcome. Thanks!