I think that winy/sherry flavour is a better descriptor than sour so it makes sense oxidation was the culprit. I'm glad it doesn't appear to be a sanitation issue! It's funny to me that this never happened in my first 4 brews but this was definitely a more susceptible recipe, 70% 2 row to 30%...
I brewed an IPA (attempted recipe here) a month ago and a few of the bottles appear to be infected. My efficiency wasn’t great so my OG was 1.069 and it finished at 1.019 but I don’t believe that’s much of a factor here. The first photo is of a sample on bottling day (bright pale colour) and the...