There are many different types of soured milk that is made at room temp traditionally. Yes the optimal temp may be 38-42C but no one knew that back in the day. It's generally made at the optimal temperature in modern times because it's faster for factory production.
For anything that ferments you should be burping it at least once a day, especially in glass even refrigerated. Anything that requires more frequent burping should be managed with an airlock
20 hours ago3 points(+0/-0/+3Score on mirror)1 child
Yeah, it does. I'm just glad it didn't happen to me yet, considering my gallon glass jugs just recently came in. The Jarrell Brothers bottle their raw milk in plastic jugs and I'd rather avoid microplastics, so.