Chunky or lumpy milk is almost assuredly bad, but you can also look out for things like discoloration or an unclean, sour smell, which happens when lactic acid in the milk starts producing bacteria.
42+ How Can You Tell If Buttermilk Is Bad
PNG. Warning ingesting bad buttermilk can lead to nausea, vomiting, diarrhea, and upset stomach. Sure signs that buttermilk has gone bad include:
How To Tell If Buttermilk Is Spoiled Ehow from s3.amazonaws.com
You can also check the edges of the carton. If you are at all unsure about the length of time the buttermilk has been open, throw it away to avoid stomach and other bodily complaints. If you don't want to decide right now if you're going to make pancakes, biscuits, mashed potatoes, or add it to a soup, this is your best option.
If it's very thick, has any signs of mold or other discolorations, smells funny, or tastes off, discard it.
This helps me alot, so many thanks to all of you who responded to this! Your senses are quite reliable to tell if buttermilk is spoiled. In case you want to elevate the shelf life of the buttermilk in the fridge, then you should thaw the carton and then freeze it for maximum 3 months. That it can last this long is not surprising, since buttermilk is high in lactic acid, which is hostile to the growth of harmful bacteria.
