Big Charlie P. in his classic book on homebrewing wrote that a visible ring formed at the liquid line in the bottle is an indicator that the batch may be contaminated.
My 2 contaminated batches formed "the ring" after about a week of bottle conditioning. I have a batch conditioning now that has likewise formed the ring, and this has me all worried. However, I did closely inspect bottles from 7 mature batches I have on hand and 3 of the 7 also has visible rings. None of these beers taste contaminated or were inoculated with bacteria. So my question is what people think about "the ring" in beer bottles and if this indeed a sign of contamination, or just more outdated info. Thanks!
My 2 contaminated batches formed "the ring" after about a week of bottle conditioning. I have a batch conditioning now that has likewise formed the ring, and this has me all worried. However, I did closely inspect bottles from 7 mature batches I have on hand and 3 of the 7 also has visible rings. None of these beers taste contaminated or were inoculated with bacteria. So my question is what people think about "the ring" in beer bottles and if this indeed a sign of contamination, or just more outdated info. Thanks!