so i brewed 2 seperate 5 gallon batches of a DFH 60min IPA clone. they were brewed about 2 days apart, sat in primary and secondary for around 3 weeks total, and were both bottled on the same day. this was about a week ago.
I popped a bottle from 1 batch open today and poured it. it was nice and clear and had about an inch and a half of head. very nice beer.
I pulled up a bottle of the other batch, and the neck of the bottle had some filmy stuff in it. if you rotate the bottle, the film coats the glass and then goes back to the top of the beer when you de-rotate. i then checked several other bottles and they all had the same problem. I'm wondering if this is just firmentation or is this entire batch infected? i opened one of them and it tasted fine. if was not however very carbonated like the first batch i tried.