how to know if buttermilk is spoiled'
Itâs perfectly normal that buttermilk separates, so you should shake the container or stir the contents with a spoon. If the consistency isnât similar to the natural one (e.g. the buttermilk is very thick), itâs the best to throw it out. Another way to tell if buttermilk has expired is to check its smell.The buttermilk might have a very sour odor, or it can simply smell spoiled. If your product has an unusual smell, it probably isnât fit for consumption.Tasting the product is your last resort in the case of determining whether it has gone bad, or not.tâs perfectly normal that buttermilk separates, so you should shake the container or stir the contents with a spoon. If the consistency isnât similar to the natural one (e.g. the buttermilk is very thick), itâs the best to throw it out. Another way to tell if buttermilk has expired is to check its smell.