So I’ve posted a couple times recently about my bad mojo and loss a a couple batches. Last week I brewed an IPA and pitched a nice big starter made from a very fresh smack pack 1272 at 60 degrees. Had a nice layer of krauesen next morning and let the temp rise to 63 for the next 4 days. Nice krauesen and pretty typical active fermentation for ale yeast at this temp, day 4 krauesen starting to fall a little. I started to let the temp go ambient and it started to rise slowly. Day 5 still 64-65 degrees and this really thick foam has developed. Now day 7 it’s fallen to about half that height.
I’ve never seen this. I want to say it’s just off gassing and a little second fermentation due to change in barometric pressure. We had a little snow overnight day 4-5 after a pretty mild period. Hopefully, I’m just being paranoid because of my recent issues but this makes me wonder about infection…
In the picture you can see the dark line where the original krauesen was, maybe an inch high, the foam is about 3 inches high in the picture.